Considering all the antifreeze types of all time. More than you thought you wanted to know.
ANTIFREEZE TYPES – IAT, OAT, HOAT, NOAT, NMOAT, POAT Engine Coolants
New school….. Bringing Choices of Long-life, Low Tox, Biodegradable, Silicate-free, Recycled and more.
The antifreeze engine coolant market is constantly being upgraded and antifreeze types are becoming more complex in a good way, as years go by. Below, a list of antifreeze types and reasons why they even exist or are becoming less popular. Most antifreeze is made by mixing distilled water with some kind of alcohol. Most antifreeze formulations are highly toxic and less than environmentally-sustainable because antifreeze or engine coolant has normally been made of ethylene glycol, water, and a chemical additive package. And each vehicle manufacturer basically has their own unique coolant specifications which are based on corrosion protection requirements, antifreeze coolant service life and the chemical compatibility. These requirements are usually specified in your vehicle owners manual or on a label or decal on the coolant reservoir, or both. The important thing is to use the coolant chemistry recommended in the vehicle owners manual.
MORE THAN YOU THOUGHT YOU WANTED TO KNOW ABOUT ENGINE COOLANTS and ANTIFREEZE TYPES
The list below is designed for either a quick scan of the bold and CAPS or to read full information on antifreeze types. A descriptive on antifreeze types that you never knew you wanted to know.
- There are compatibility issues between antifreeze types.
- Some environmentally-friendly choices and, yes, safer antifreeze types are available that protect your vehicle more than conventional antifreeze.
After reading all this, you will wish for an antifreeze that is compatible with all engine coolant – antifreeze types, including HOAT and OAT and IAT, antifreeze that stops leaks, extended life antifreeze with low toxicity, an antifreeze that is safer for pets and the environment and safe for aluminum and solders. Enter the POAT antifreeze type.
- ANTIFREEZE TYPES – IAT, OAT, HOAT, NOAT, NMOAT, POAT Engine Coolants
- MORE THAN YOU THOUGHT YOU WANTED TO KNOW ABOUT ENGINE COOLANTS and ANTIFREEZE TYPES
- Antifreeze Colors Designate Quality and Ingredients in Antifreeze Types ( Antifreeze types colour )
- Propylene Glycol Antifreeze ( PG )
- ** One AMSOIL Antifreeze is propylene glycol based. Two are ethylene glycol, regular and heavy duty.
- Nitrated Organic Acid Technology (NOAT)
- Nitrite Molybdate Organic Acid Technology (NMOAT)
- Poly Organic Acid Technology (POAT)
- ** AMSOIL Antifreeze is POAT.
- ** AMSOIL is not toxic ethylene glycol, is not an OAT antifreeze type and definitely provides more protection.
- Inorganic Additive Technology Antifreeze (IAT)
- ** AMSOIL is not IAT.
- Why Silicates and Phosphates in Most Antifreeze Engine Coolants?
- Silicate-free Antifreeze / Low Silicate Antifreeze Types
- Phosphate-free Antifreeze Type
- **AMSOIL antifreezes are all three phosphate-free.
- Long Life Antifreeze and Extended Life Antifreeze Types
- Low Tox Antifreeze / Non Toxic Antifreeze Types
- Pet Safe Antifreeze / Safe Antifreeze Choices
- Universal Antifreeze Type
- What we need to know about universal engine coolants when they are added to you existing engine coolant.
- UNIVERSAL ENGINE COOLANTS for…..
- IAT or the original antifreeze with INORGANIC ACID TECHNOLOGY.
- OAT or the 1996 long life antifreeze type introduced by the auto manufacturers with ORGANIC ACID TECHNOLOGY.
- HOAT which is also a long life antifreeze type but with HYBRID ORGANIC ACID TECHNOLOGY.
- NOAT, a long life antifreeze type with nitrates added so it is NITRATED HYBRID ORGANIC ACID TECHNOLOGY.
- NMOAT, a long life antifreeze type with nitrates and molybdates so it is NITRATED MOLYBDATE ORGANIC ACID TECHNOLOGY.
- POAT, a long life antifreeze type that is essentially a hybrid except there are proprietary poly organic ingredients so it is a POLY ORGANIC ACID TECHNOLOGY.
- NOTE: Propylene glycol antifreeze can only be recycled with propylene glycol antifreeze, or it becomes ethylene glycol. There are residential-sized recycling machines, if that is worth it to anyone.
- AMSOIL POLY ORGANIC ACID TECHNOLOGY – AMSOIL Propylene Glycol Antifreeze, biodegradable engine coolant. More information here.
** AMSOIL Propylene Glycol Antifreeze is a poly organic acid technology or the POAT antifreeze type. And AMSOIL also produces in USA, by the way, some ethylene glycol 50/50 mixes. Regular and heavy duty. Quite effective. See product info here.
Looking for an antifreeze type that is compatible with late model cars? Modified? Classic vintage cars? Concerned the new antifreeze types or the antifreeze additive packages will corrode the solder or break down the gaskets? AMSOIL formulated for protection.
Antifreeze Colors Designate Quality and Ingredients in Antifreeze Types ( Antifreeze types colour )
Many people search out their antifreeze by colour, thinking they are getting what they purchased before, even though it is a different brand. ANTIFREEZE COLOUR color at present and in the not so distant past is best used for you to tell if the antifreeze is leaking because the color of antifreeze is no longer an accurate indicator for whether the antifreeze type is an IAT, OAT, HOAT or NOAT. With multiple shades of orange, red and red-orange, dark green and standard green, blue and blue-green, yellows, clear and even pink and purple — so you cannot tell by choosing your antifreeze from a color wheel anymore. Typical green was the market norm since 1926 in the USA and blue in the UK, until the last several years when extended life formulas were added. Antifreeze was simple and toxic and now it is not simple and does not have to be toxic. Read on.
** Propylene glycol AMSOIL Antifreeze is dyed a neutral yellow so it can be added to the other antifreeze types, therefore the color remains the same as the original antifreeze type you have added to if you did not do a full radiator flush first. With AMSOIL Antifreeze, you are not required to do a full flush, it is compatible with all antifreeze types. AMSOIL provides detailed application data.
Ethylene Glycol Antifreeze ( EG )
Conventional antifreeze formulations have been based on ethylene glycol since 1926 until around 2003 in factory fill GM automobiles. The conventional antifreeze type is called IAT or Inorganic Acid Technology. More IAT below. The ethylene glycol antifreeze types usually contain several inorganic corrosion inhibitors to provide immediate corrosion protection as they maintain or buffer the pH of the solution. ESPECIALLY SALTS! Good to note: AMSOIL Antifreeze/Coolants are poly-organic acid formulations that do not contain inorganic salts (phosphate, nitrate, nitrite, silicate, borate, amine) found in conventional and hybrid organic acid (HOAT) antifreeze/coolants. Unfortunately, the buffers in this antifreeze type are chemically transformed or consumed as they function. So as ethylene glycol antifreeze coolant is heated, cooled, exposed to air, components of the conventional ethylene glycol antifreeze additive package are depleted over time and the pH drops. This corrosion and pH drop is why the ethylene glycol antifreeze type of engine coolant needs to be changed every two years or 24,000 miles. The conventional ethylene glycol antifreeze formulations have been marketed as permanent antifreeze since they were introduced in the Vintage Car Era along with power steering and actuated brakes. The conventional antifreeze allowed water-cooled automobiles to use used year-round but was further developed for higher boiling points providing advantages for summertime use as well as during cold weather. Ethylene glycol antifreeze types are used today for automobiles and other applications because EG is less expensive even though it is poison. The EG formulations are gradually being replaced by propylene glycol due to its much lower toxicity. AMSOIL formulates both. We use the prop glycol, our preference as we are environmentalists. But know there is a place for everything.
Propylene Glycol Antifreeze ( PG )
Propylene Glycol Antifreeze is extremely low toxicity compared to the extremely high toxicity of ethylene glycol. It is allowed to be labeled “non-toxic antifreeze”. Propylene glycol antifreeze is increasing in popularity die to the low toxicity and because many hybrid antifreeze brands are including it in their formulations. Food processing and water pipes in homes and swimming pools are places where propylene glycol antifreeze are used. Though controversial with organic consumers, the FDA allows propylene glycol as an ingredient in processed foods. Propylene glycol oxidizes when exposed to air and heat, forming lactic acid, creating corrosion, also bacteria and biological fouling. With propylene glycol antifreeze types, pH buffering agents are added to propylene glycol, to prevent acidic corrosion of metal components.
Due to the hydrogenolysis technology by Archer Daniels Midland Company, (ADM) propylene glycol (PG) is on its way to becoming a green chemical. PG was traditionally produced from petroleum-derived propylene oxide. However, ADM developed the proprietary glycols technology to use the catalytic process — hydrogenolysis — converting glycerin and sorbitol into propylene glycol. Products as the result of hydrogenolysis include propylene glycol and water. ADM’s separation technology meets industrial standards and United States Pharmacopeia (USP) excipient grades, therefore there is now a sustainable propylene glycol. The times are changing.
** One AMSOIL Antifreeze is propylene glycol based. Two are ethylene glycol, regular and heavy duty.
Hybrid Organic Acid Technology Antifreeze Type (HOAT)
HOAT stands for Hybrid Organic Acid Technology, also known as G O-5. HOAT is an extended life antifreeze type. Hybrid OAT (HOAT) formulations are hybrid because additive packages contain ingredients from newer OAT ethylene glycol antifreeze types and the conventional ethylene glycol green formulas with nitrites added. HOAT is compatible with both the ethylene glycol antifreeze. HOAT is suitable for use in light duty and heavy duty systems. But, HOAT is not to be confused with OAT, below, but usually is. And, to be a HOAT antifreeze does not mean it is Dex-Cool, either, also below. Though HOAT does eliminate antifreeze incompatibility since this antifreeze type is compatible with all antifreeze types and colors. Some HOAT formulations contain recycled antifreeze. Some are marketed as GO-5. Normal HOAT antifreeze service life is 5 years or 150,000 miles (250,000 km).
** ALL THREE AMSOIL ANTIFREEZE CHOICES ARE NOT HOAT but it are compatible with all antifreeze types. AMSOIL Antifreeze is also compatible with fully formulated diesel anti-freezes and other organic acid technology (OAT) and hybrid organic acid technology (HOAT) formulations.
Nitrated Organic Acid Technology (NOAT)
NOAT or Nitrated Organic Acid Technology antifreeze means an OAT antifreeze type with nitrates added. NOAT is suitable in light duty and heavy duty systems. The NOAT and HOAT antifreeze types are similar in performance characteristics therefore the NOAT service life also is 5 years or 150,000 miles.
Nitrite Molybdate Organic Acid Technology (NMOAT)
Nitrite Molybdate Organic Acid Technology (NMOAT) is familiar for wet sleeve applications. NMOAT is often similar to heavy duty antifreeze formulations like Caterpillar and International. NMOAT is also compatible with automotive OAT antifreeze types of engine coolant except it contains the fully-formulated attribute of nitrite and molybdate for diesel wet sleeve liner protection.
Poly Organic Acid Technology (POAT)
Poly organic acid technology (POAT) is advanced antifreeze technology. AMSOIL Antifreeze is POAT. AMSOIL Antifreeze contains a proprietary poly organic acid technology. It eliminates the need for supplemental coolant additives and recharging cooling systems. AMSOIL Antifreeze & Coolant provides extended service life in all gasoline and diesel vehicles. It can be used for five years or 150,000 miles in passenger cars, light-duty trucks, vans and recreational vehicles. AMSOIL POAT lasts six years or 600,000 miles in over-the-road diesel trucks. POAT is also for motorcycles, ATVs, snowmobiles and closed marine applications. Note, AMSOIL Antifreeze and Engine Coolant lasts longer than conventional products.
Organic Acid Technology (OAT) or the DEX-COOL Antifreeze Type – GM Uses in Factory Fill Engine Coolant
The organic additive technology is the original extended life formulation. OAT was introduced to reduce maintenance costs for consumers, downtime and environmental disposal costs and issues. General Motors ( GM ) began using the new extended-life antifreeze, called Dex-Cool back in 1996. Consumers became confused because the factory fill coolant contains a totally different kind of additive package called Organic Acid Technology (OAT) which is not HOAT or hybrid organic acid technology. This says organic and they are, including sebacate, 2-ethylhexanoic acid or 2-EHA and other organic acids. Silicates and phosphates are not included in OAT types of antifreeze though. That said, one of the primary problems with OAT formulations is they are not compatible with conventional antifreeze types because the chemicals used in OAT antifreeze will react to some extent with some of the inorganic salts and other components in conventional antifreeze types (IAT). OAT interaction generates cloudiness and precipitates. OAT corrosion inhibitors are slower acting to provide protection over a longer period of time — five years or 150,000 miles. OAT antifreeze factory-fill coolant is also used in 1996-and-newer Audi, Jaguar, Porsche, Volkswagen and Land Rover, 2001-and-newer Saab, and 1996-and-newer Toyota, Nissan, Honda, Mazda and other Asian makes. The OAT antifreeze type provides protection for aluminum, but may not be the best choice for older vehicles where the copper/brass radiators have a lead-based solder.
** AMSOIL is not toxic ethylene glycol, is not an OAT antifreeze type and definitely provides more protection.
Inorganic Additive Technology Antifreeze (IAT)
The original antifreeze type. Here, we again have the conventional chemical composition additive for traditional antifreeze. What is confusing is the IAT antifreeze additive can be in either ethylene glycol (EG) or propylene glycol (PG) though the propylene glycol antifreeze was unheard of when the IAT was the norm. These would be blue in the UK and green in the USA where it is called conventionally inhibited. There are other colours too. Normally, an IAT antifreeze service life is two years or 30,000 miles.
** AMSOIL is not IAT.
Why Silicates and Phosphates in Most Antifreeze Engine Coolants?
Conventional coolants usually use a phosphate and silicate mix in their inhibitor system. These conventional inhibitors, the silicates and phosphates, work by forming a protective blanket to insulate metals from the coolant. These inhibitors are characterized chemically as inorganic oxides, known as silicates, phosphates, borates and more. The problem is these inhibitor systems become depleted by forming that protective layer. Therefore, the conventional coolants need to be changed at regular intervals, most often suggested at every two years. Not very sustainable.
Silicate-free Antifreeze / Low Silicate Antifreeze Types
Silicates in effect are salts in your cooling system. They also become the solids in your system because they clean deposits through the abrasive action they produce while traveling through the cooling system. They can also seal up small holes with these deposits. Silicates in antifreeze can bring the good and the ugly.
Silicates in a cooling system do offer metal parts fast acting protection with a high level of coverage over all the metal to prevent corrosion and pitting. Silicates also charge up the cooling system. This protection lasts only two years then turns against the engine, resulting in plugging between sleeves, pitting and the metal deterioration when the silicates are no longer in the solution. This is called SILICATE DROP OUT which occurs after the coolant has been “spent” and inhibitors drop out of solution. After this, deposit build up in radiators and heaters cause engine overheating and poor heater performance while metal components deteriorate.
Silicate free antifreeze is preferred due to the plugging caused by silicates and the unnecessarily quick turnover time for your antifreeze interval.
Phosphate-free Antifreeze Type
Hard water minerals create issues with phosphate inhibitors. Calcium and magnesium are minerals found in hard water and these react with phosphate inhibitors. When the calcium and magnesium react with the phosphate inhibitors in antifreeze types, they form calcium or magnesium phosphate. This leads to scale formation on hot engine surfaces. Loss of heat transfer or corrosion under the scale formation are two pitfalls in antifreeze that you do not want.
Phosphate free antifreeze engine coolant is preferred because it contains a mix of inorganic oxides called carboxylates to provide corrosion protection by chemically interacting at the metallic corrosion sites. This is instead of forming a layer of inhibitors that covers the total surface. The mix is called hybrid technology because it is a mix of conventional inorganic technology and fully carboxylate or organic technology.
**AMSOIL antifreezes are all three phosphate-free.
Long Life Antifreeze and Extended Life Antifreeze Types
THERE IS A DIFFERENCE — Organic additive technology (OAT) is the original extended life formulation. OAT was introduced to reduce maintenance costs for consumers, downtime and environmental disposal costs and issues. But the conventional long life antifreeze types still included ethylene glycol base because it was less cost. AMSOIL is not one of the original extended life formulations.
** AMSOIL Propylene Glycol Antifreeze allows all the benefits of long life antifreeze or extended life antifreeze but by using a low toxicity base of propylene glycol. Wholesale prices are given for buyer’s club members (preferred customers).
Biodegradable Antifreeze / Environmentally-friendly Antifreeze Types
Low Tox Antifreeze / Non Toxic Antifreeze Types
Pet Safe Antifreeze / Safe Antifreeze Choices
Sometimes a company markets their antifreeze as environmentally-friendly because it has developed an ethylene glycol recycled antifreeze. Wrong. There is more to consider to be even close to environmentally-friendly and market a safe antifreeze.
Recycled ethylene glycol antifreeze may be a little bit green because there is no disposal issue, in fact recycling offers a solution to antifreeze disposal, so the recycled antifreeze is environmentally-friendly antifreeze. But ethylene glycol antifreeze, recycled or not, is not safe antifreeze and cannot be considered a non-poisonous engine coolant.
Propylene Glycol NEEDED in Formulation — Because of propylene glycol in the formulation, a true environmentally-friendly, low toxicity antifreeze is by far, extremely less toxic than conventional ethylene glycol based antifreeze. Therefore, it is safer to pets, people, wildlife, the land, water sources. In cases of misuse, careless storage, spills, leaks, boil-overs and careless disposal. antifreeze can pollute the environment, destroy water sources, kill children, pets and wildlife.
AMSOIL Propylene Glycol Antifreeze contains 1, 2 Propanediol. Synonyms: Monopropylene glycol. This was added to antifreeze formulations in Sweden when the country ruled against further use of ethylene glycol in antifreeze. Though still a toxicity that rates on the MSDS sheet for AMSOIL Antifreeze, the 1, 2 Propanediol is substantially lower toxicity. The hygroscopic properties are used in food as a humectant and preservative, it is an approved additive in foods and used in bakery goods. In personal care and cosmetics, the softening and humectant properties are utilized. Also 1,2-propanediol is used as a solvent in pharmaceutical preparations containing some water-soluble ingredients. The substance is used as a plasticizer in materials that come into contact with food and as a lubricant for food machinery. While highly controversial for the organic among us, for a safe, environmentally-friendly, low tox antifreeze that is not poison, propylene glycol is the best choice.
Disposal of antifreeze, both ethylene glycol and propylene glycol. Dispose of responsibly. This does not mean that if your local sewer department allows you to dispose of antifreeze in the sewer drain or down the toilet if you only have residential use (what is that? about two gallons for a car, four or more for an SUV or truck? Really? Antifreeze down the drain?) There are antifreeze disposal companies that are sending both ethylene glycol and propylene glycol antifreeze to antifreeze recycling businesses by the 5,500-gallon drum. Let’s all be a part of the recycling foundation for antifreeze. That makes for some safe antifreeze if it never sees the light of day or the drain pipe of any water source.
A SINGLE GALLON OF USED ETHYLENE GLYCOL ANTIFREEZE CAN RENDER 10,000 GALLONS OF GROUND WATER UNDRINKABLE.
Antifreeze Recycling for Recycled Antifreeze – also called ‘Upcycling’
Antifreeze recycling requires a used antifreeze stream from many sources. The main sources are independent garages that collect it in drums the antifreeze recycling company provides and from environmental companies that deliver used antifreeze by the tanker load of up to 5500 gallons at a time. Used antifreeze also comes from evacuation of HVAC systems and generators. The inspection of the used antifreeze begins during field collection and with requirements of allowed antifreeze recycling pickup and deposits.
Used antifreeze is processed through several proprietary stages until it goes through the vacuum distiller. During the cleaning process, all dissolved solids and chemicals are removed along with water. The solids is called sludge which is removed by the tons, including Benzene, Barium, Cadmium, Lead, Silver, Chlorides, Arsenic, Chromium, Mercury, Selenium, Chloroform and more. The processing in antifreeze recycling is done until the stream is as clean as virgin ethyglycol and is ready to be blended into premium coolant.
In antifreeze recycling, distilled water adjusts the concentration to 50/50. Then, most often, reclaimed glycol is used to produce the recycled coolants and often adding fully formulated inhibitors. Thus, there is recycled antifreeze for resale.
Universal Antifreeze Type
Universal antifreeze or universal coolants were designed to eliminate the colour and chemistry confusion we talked about above. Companies were right about consumers preferring to have one antifreeze type that will work in all their vehicles, despite the year, make or model and less shelf space needed for antifreeze while they are no longer confused on which to use with which vehicle and not kill it. Though not all the antifreeze manufacturers agree with the universal antifreeze philosophy. Those who offer universal engine coolant have two choices, the full coverage, full-strength antifreeze or a 50/50 mix. Universal coolants are formulated for compatibility with domestic and foreign cooling systems. Universal coolants are designed to be mixed with all coolant types. This includes the traditional green or IAT….. the organic acid technology or original long life antifreeze type or OAT…… the OAT-hybrid with silicates or HOAT. The new universal engine coolant that combines with all these is often a Poly organic acid technology or POAT, though not always. The new universal coolants do always use OAT-based corrosion packages that include proprietary organic acids like carboxylate which provides the much needed broad spectrum protection for a universal conglomerate of vehicles, often including diesel. Universal coolants are not lifetime engine coolants, there is a service interval on all antifreeze types. The service interval is not increased because you have added universal engine coolant to one of the antifreeze types with less service life. Beware this confusion.
What we need to know about universal engine coolants when they are added to you existing engine coolant.
- When the universal engine coolant you choose is added to your cooling system that already contains a longlife organic acid technology or OAT antifreeze type —- or is added to a hybrid organic acid technology or HOAT antifreeze type, the service life of your original engine coolant does not increase, ever. Your engine coolant service life will remain at the lesser quality of antifreeze, you gain nothing when topping off the radiator.
- When the universal engine coolant is added to an older vehicle that has the IAT or inorganic acid technology, meaning the traditional green antifreeze in your vehicle’s cooling system, your antifreeze service life is the same as the IAT service life. You gain no extra time. If you attempt to take the extra time in your service interval, you risk drop out and corrosion and leaks plus less heat transfer.
- Let’s say that one more way, just to be certain your vehicle does not come at risk when using universal engine coolant, which, in fact is a very good thing. If your vehicle or equipment cooling system is being refilled with a universal coolant, your cooling system needs to be flushed first. This will remove all the traces of the old coolant and will remove contaminants. This is the only way to get the universal coolant’s maximum service life.
- If you are not flushing the radiator, but are only draining it, then as much as one-third of the old coolant can remain in the block and will dilute the universal engine coolant. The protection of your universal coolant will only be able to be trusted to the depth of protection that the original engine coolant offered. much beyond that of the original coolant.
UNIVERSAL ENGINE COOLANTS for…..
Older cars:::: classic cars or pre-war cars were built to use an “inorganic acid” coolant or IAT that has typically been green in color. This is the conventional antifreeze with ethylene glycol that was developed back in 1926, though now it could be propylene glycol or ethylene glycol. Universal coolants have bridged a gap between low service life, highly toxic engine coolants for vintage or classic cars and the premium POAT antifreeze type or engine coolant that is biodegradable, substantially safer and much more protective of your engine.
AMSOIL Universal Propylene Glycol Antifreeze is often recommended on the vintage car and classic truck websites and online magazines.
Diesel:::: Diesels take on some intense temperatures and operating conditions. The antifreeze type they need must extend maximum protection in antifreeze and cooling. AMSOIL Antifreeze Engine Coolant works extremely well in gasoline and diesel vehicles and equipment. The service life is up to seven years or 250,000 miles for cars, vans, light-duty trucks and RVs. For diesel over-the-road trucks, the AMSOIL Prop Gly Antifreeze can last as much as 750,000 miles. Again, diesel owners have been using AMSOIL antifreeze long enough to know they are not guinea pigs, it is proven effective for diesel too. For diesel, AMSOIL also formulates the Poly Organic Acid Technology Ethylene Glycol 50/50 Heavy Duty Antifreeze. Protection up to 600,000 miles, 12,000 hours or 6 years, whichever comes first.
SUMMARY: Antifreeze types along with choices include….
IAT or the original antifreeze with INORGANIC ACID TECHNOLOGY.
- Choices: Ethylene glycol and now propylene glycol choices. Recycled.
OAT or the 1996 long life antifreeze type introduced by the auto manufacturers with ORGANIC ACID TECHNOLOGY.
- Choices: Ethylene glycol and now propylene glycol choices. Recycled.
HOAT which is also a long life antifreeze type but with HYBRID ORGANIC ACID TECHNOLOGY.
- Choices: Ethylene glycol and now propylene glycol choices. Universal. Recycled sometimes.
NOAT, a long life antifreeze type with nitrates added so it is NITRATED HYBRID ORGANIC ACID TECHNOLOGY.
- Choices: Ethylene glycol and now propylene glycol choices. Recycled. Can be universal, but must need nitrates.
NMOAT, a long life antifreeze type with nitrates and molybdates so it is NITRATED MOLYBDATE ORGANIC ACID TECHNOLOGY.
- Ethylene glycol and now propylene glycol choices. Recycled. Can be universal, but must need nitrates.
POAT, a long life antifreeze type that is essentially a hybrid except there are proprietary poly organic ingredients so it is a POLY ORGANIC ACID TECHNOLOGY.
- Ethylene glycol and now propylene glycol choices. Universal. AMSOIL antifreezes are all three POAT or poly organic acid formulations. No salts, no nitrates, no corrosion.
NOTE: Propylene glycol antifreeze can only be recycled with propylene glycol antifreeze, or it becomes ethylene glycol. There are residential-sized recycling machines, if that is worth it to anyone.
AMSOIL POLY ORGANIC ACID TECHNOLOGY – AMSOIL Propylene Glycol Antifreeze, biodegradable engine coolant. More information here.
Well, by reading you can tell which AMSOIL antifreeze is preferred here. The prop gly which is more biodegradable (not dump-on-the-ground-able though) and that is safer than the conventional. But for the vehicles, both types are effective and protective of your cooling system.
If you haven’t done so yet, go on and check out our AMSOIL slogans page on the homefront.
Bruce and Diane Adams, Independent AMSOIL Direct Dealers, zo1755968