AMSOIL guide
AMSOIL Coolant Guide
AMSOIL builds three antifreeze and engine coolant lines: Passenger Car & Light Truck with OAT chemistry rated for up to 250,000 miles, Heavy-Duty for diesel pickups and commercial fleet trucks, and Propylene Glycol for owners who want lower toxicity to pets and people. All three protect all cooling system metals (aluminum, brass, copper, cast iron, solder, steel) and are engineered for modern OAT and HOAT compatibility. Match the chemistry to your vehicle, ignore the color of what is in the radiator, and do a complete drain and refill rather than topping off across chemistries.
Shop AMSOIL Antifreeze & Coolant
AMSOIL antifreeze and coolant lineup at a glance
| Coolant | Best fit | Where to buy |
|---|---|---|
| Passenger Car & Light Truck (ANTPC) | Most cars and light trucks, OAT/HOAT compatible, up to 250,000 mi | Buy online | Product details |
| Heavy-Duty (ANTHD) | Diesel pickups, commercial fleet trucks, off-highway diesel | Buy online | Product details |
| Propylene Glycol Low-Tox (ANT) | Pet households, classic cars, hot rods, drag racing | Buy online | Product details |
| Powersports Antifreeze & Coolant | Snowmobile, motorcycle, ATV, UTV liquid-cooled engines | Buy online | Product details |
Coolant chemistry: OAT, HOAT, IAT, and why color is not a spec
Modern engine coolants fall into a small set of chemistry families. OAT (Organic Acid Technology) uses long-life carboxylate inhibitors and is the standard for current GM, Ford, BMW, VW, Audi, and many other OEMs. HOAT (Hybrid OAT) uses a blend of organic acid and inorganic silicate or phosphate inhibitors, common in Chrysler, Mercedes-Benz, and many Asian-import applications. IAT (Inorganic Additive Technology) is the traditional silicate/phosphate green coolant, mostly retired from current vehicles.
The single most common mistake is using color as a spec. A green coolant can be IAT or a hybrid OAT, and an orange coolant can be Dex-Cool OAT or a different OAT family. Always match the OEM-specific spec, not the color. AMSOIL Passenger Car & Light Truck Antifreeze & Coolant uses an advanced OAT chemistry that is engineered for compatibility with most modern OAT and HOAT coolants in current cars and light trucks.
Passenger Car & Light Truck Antifreeze & Coolant
AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is the standard pick for most cars and light trucks built since the early 2000s. It uses a poly-organic acid (OAT) chemistry for modern cooling systems. The pre-mixed formulation pours straight in, and the additive package protects aluminum, brass, copper, cast iron, solder, and steel. Confirm current service guidance on the AMSOIL Lookup Guide and in your owner's manual.
Low-toxicity propylene glycol option
For owners with pets, kids, or backyard hot-rod projects, the lower toxicity of propylene glycol (PG) over ethylene glycol (EG) is a meaningful difference. AMSOIL Propylene Glycol Antifreeze and Engine Coolant delivers freeze protection down to -34°F (-36°C) and boil-over protection to 265°F (129°C) with a 15-psi cap, with PG instead of EG. The full breakdown lives in the non-toxic antifreeze guide.
Bottom line: which AMSOIL coolant should you pick?
- Most modern cars and light trucks (OAT or HOAT spec). Pick AMSOIL Passenger Car & Light Truck Antifreeze & Coolant (also online from AMSOIL).
- Diesel pickup or fleet truck. Pick AMSOIL Heavy-Duty Antifreeze & Coolant.
- Pet household, classic car, hot rod, or drag racing. Pick AMSOIL Propylene Glycol Antifreeze; see the non-toxic antifreeze guide.
- Snowmobile, motorcycle, ATV, or UTV liquid-cooled engine. Pick AMSOIL Powersports Antifreeze & Coolant.
Save on AMSOIL with Preferred Customer pricing
AMSOIL Preferred Customer membership is $20 USD per year ($10 USD for a six-month trial) and unlocks up to 25% off on every product, with free shipping on qualifying orders. Add the membership to the same cart as your order and qualifying products switch to member pricing on that checkout, with no separate sign-up step. See the breakdown on the AMSOIL Preferred Customer page, or sign up directly through the AMSOIL Preferred Customer enrollment page.
AMSOIL coolant FAQ
Can I mix AMSOIL coolant with what is in my radiator now?
Best practice is a complete drain and refill rather than topping off across coolant chemistries. AMSOIL Passenger Car & Light Truck Antifreeze & Coolant uses an advanced poly-organic acid (OAT) chemistry that is engineered for compatibility with most modern OAT and HOAT coolants, but mixing dilutes the targeted additive package. For consistent corrosion protection across the cooling system, drain the old coolant and refill with the matching AMSOIL product.
Does coolant color matter?
No. Color is a dye choice, not a spec. A green coolant can be a traditional inorganic-additive-technology (IAT) coolant or a hybrid OAT, and an orange coolant can be a Dex-Cool OAT or a mixed-chemistry coolant. Match the chemistry (OAT, HOAT, NOAT, NAP-free) and the OEM-specific spec, not the color.
How often should I change coolant?
Most OEM-recommended intervals run from 5 years or 100,000 miles for current OAT coolants to as long as 250,000 miles in some heavy-duty fleet applications. AMSOIL Passenger Car & Light Truck Antifreeze & Coolant is rated for up to 250,000 miles or 8 years of service in passenger cars and light trucks.
What is propylene glycol antifreeze?
Propylene glycol (PG) antifreeze uses propylene glycol instead of the more common ethylene glycol (EG). PG is significantly less toxic to people and pets than EG. AMSOIL Propylene Glycol Antifreeze and Engine Coolant delivers the freeze and boil-over protection of EG coolant with much lower toxicity. See the non-toxic antifreeze guide for the full breakdown.
Is AMSOIL coolant safe for aluminum cooling systems?
Yes. AMSOIL Passenger Car & Light Truck Antifreeze & Coolant protects all cooling system metals including aluminum, brass, copper, cast iron, solder, and steel. The OAT chemistry specifically targets the aluminum and steel found in modern engines.
Where do I buy AMSOIL coolant?
Order online from AMSOIL on the antifreeze and coolant page. The matching antifreeze and coolant overview covers passenger car, heavy-duty, low-tox, and powersports antifreeze with side-by-side spec comparisons.
Order AMSOIL antifreeze and coolant
Order online from AMSOIL's antifreeze and coolant page. To unlock up to 25% off, add an AMSOIL Preferred Customer membership to the same cart and qualifying products switch to member pricing immediately, with no separate sign-up step.