Coolant Buying Guide · Reviewed Oct 3, 2026
Where to Buy Propylene Glycol Antifreeze (US & Canada, 2026)
Propylene glycol (PG) antifreeze is a lower-toxicity alternative to the ethylene glycol used in most engine coolants. Here is where to find it, and how to avoid buying the wrong product.
By Alan Williams, independent AMSOIL Dealer since 2004, Tomball, TX
Where can I buy propylene glycol engine antifreeze?
Buy it from AMSOIL (Preferred Customers and Dealers), equipment and farm dealers, and some auto parts, marine and industrial suppliers. Stock varies, so confirm that the label says engine antifreeze or coolant, not just “RV” or “potable water” antifreeze.
Do not mix propylene and ethylene glycol coolants. If you must top off with the other type, plan to flush the system.
Where to buy propylene glycol antifreeze
| Source | Good for | Check |
|---|---|---|
| AMSOIL.com (Preferred Customer or Dealer) | AMSOIL Propylene Glycol Antifreeze and Engine Coolant in gallon jugs and drums | Availability and pack sizes change. See the product page. |
| Equipment, farm and marine dealers | Machines whose manuals call for PG coolant | Ask for the OEM-approved PG product. |
| Auto parts and hardware stores | “Low-toxicity” coolants | Confirm it is an engine coolant, not winterizer. |
| Industrial suppliers | Larger volumes | Confirm inhibitors and mix ratio. |
For AMSOIL’s product details, see the AMSOIL propylene glycol antifreeze page. I do not list prices here because they change.
Propylene glycol vs ethylene glycol
| Propylene glycol | Ethylene glycol | |
|---|---|---|
| Toxicity | Lower toxicity, biodegradable | Acutely toxic |
| Heat transfer | Slightly lower | Higher |
| Cold-weather flow | Thicker at low temperature | Thinner at low temperature |
| Most common use | Low-toxicity applications, some equipment | Most car and truck coolants |
Check your owner’s or equipment manual first. Some machines specify PG, and most cars specify ethylene glycol coolants.
Buying AMSOIL coolant or oil? Preferred Customers pay about 25% below suggested retail.
Do not use RV winterizer in an engine
RV and plumbing “antifreeze” is often propylene glycol too, but it is made to protect potable water lines, not to carry heat or protect engine metals. Use a product labelled as engine antifreeze and coolant.
Mixing and flushing
AMSOIL’s data sheet warns that mixing propylene and ethylene glycol formulations makes freeze protection hard to predict. If a top-off is unavoidable, flush the cooling system at the next convenient opportunity.
Propylene glycol antifreeze FAQ
Is propylene glycol antifreeze safe for engines?
Yes, if the product is formulated as an engine coolant and your manual allows it. Do not use plumbing or RV winterizer.
Can I mix propylene and ethylene glycol coolant?
It is not recommended. Mixing makes freeze protection unpredictable, so flush the system if you must top off.
Is propylene glycol less toxic?
Yes. It is considered lower toxicity than ethylene glycol, but coolants still contain additives, so keep them away from children and pets.
Does propylene glycol cool as well?
Slightly less heat transfer than ethylene glycol, and it is thicker in the cold. Follow your manual.
Can I buy propylene glycol coolant in Canada?
Yes, through AMSOIL.ca and equipment or industrial suppliers. Stock varies.
Get AMSOIL coolant and oil at wholesale cost
AMSOIL Preferred Customer membership is $20/year (or a $10 six-month trial), with free shipping on orders of $100 or more.
Sources (checked Oct 3, 2026): AMSOIL: Propylene Glycol Antifreeze and Engine Coolant · AMSOIL data sheet G1156 (via Main Street Oil) · Ecolink: propylene vs ethylene glycol
AMSOIL is a registered trademark of AMSOIL INC. LubeOilSales.com is operated by Alan Williams, an independent AMSOIL Dealer (Dealer #1243776), and is not owned or endorsed by AMSOIL INC. If you join through my links, I may earn a commission at no extra cost to you. This guide is general information. Follow your owner’s manual and consult a qualified professional when in doubt. Content last reviewed October 3, 2026.