Quick answer
ASTM D4985: ASTM D4985 is the ASTM standard specification for low-silicate ethylene glycol engine coolant for heavy-duty engines that needs an initial charge of supplemental coolant additive (SCA).. 39 products in our directory list it. Buy one that names the exact code from your manual.
Key takeaways
- 39 coolants in our data list this code.
- Match the exact code and suffix in your manual, not the colour.
- A listed code is the coolant maker's claim.
Confirm the specification in your owner’s manual before buying. Product examples are not a fitment guarantee.
On this page
What the code means
ASTM D4985 is the ASTM standard specification for low-silicate ethylene glycol engine coolant for heavy-duty engines that needs an initial charge of supplemental coolant additive (SCA).
In our directory, 39 products from 7 brands (Castrol, Mobil, PEAK, Prestone, Shell, Valvoline, Zerex) list this code. Chemistries their makers state: OAT (10), IAT (7), HOAT (4), Si-OAT (4), P-OAT (2). Forms: Concentrate (19), Premix 50/50 (13), Concentrate and Premix 50/50 (1), Premix (ready to use) (1).
For the make-by-make answer, see the heavy-duty diesel coolant guide.
Coolants whose maker lists it (39)
Each row is a product whose manufacturer lists this code on its own page or datasheet (data checked 22 Oct 2026). A listed code is the maker's claim; we have not tested the products. Products with a checked Amazon listing come first.
As an Amazon Associate I earn from qualifying purchases. Commissions never change which products we list or what the data says.
How to use this list
- Find the exact code in your owner's manual, service book or equipment documentation.
- Pick a product above that lists the same code, including any letter or suffix.
- Open the product page to read the maker's exact wording ("approved", "meets" or "suitable for" are not the same).
- Do not mix chemistries. Check with the mixing checker before topping up.
Related spec codes
US Federal Spec A-A-870 · BS 6580 · SAE J1034, J814 and J1941 · ASTM D3306 · ASTM D6210 · All coolant specs
Frequently asked questions
Which coolants meet ASTM D4985?
In our directory, 39 products list it, including PEAK All Vehicles 50/50 Prediluted Antifreeze + Coolant, PEAK All Vehicles Concentrate Antifreeze + Coolant, PEAK DEX-COOL Concentrate Antifreeze + Coolant. The full list is on this page.
Can I use a universal coolant instead of ASTM D4985?
Only if the maker of that universal coolant lists this exact code on the label or datasheet. "Compatible with all makes" is not the same as listing the code.
Where do I find the ASTM D4985 requirement?
In the owner's manual or service literature, usually in the fluids or capacities section, and sometimes on the reservoir cap.
How we source this page
- Facts come from manufacturer pages, datasheets, owner's manuals and standards bodies, linked under Sources.
- We do not test products, and no brand pays to be listed or ranked. Advertising and affiliate links are labelled and never change the data.
- Anything we could not find is marked "not published" rather than guessed. Spotted an error? Tell us.
Sources
- PEAK: PEAK All Vehicles 50/50 Prediluted Antifreeze + Coolant (manufacturer page)
- PEAK: PEAK All Vehicles Concentrate Antifreeze + Coolant (manufacturer page)
- PEAK: PEAK DEX-COOL Concentrate Antifreeze + Coolant (manufacturer page)
- PEAK: PEAK Global Lifetime 50/50 Antifreeze + Coolant (manufacturer page)
- PEAK: PEAK Global Lifetime Concentrate Antifreeze + Coolant (manufacturer page)
- PEAK: PEAK ORIGINAL EQUIPMENT TECHNOLOGY Antifreeze + Coolant 50/50 Prediluted for North American Vehicles - GOLD (manufacturer page)
- PEAK: PEAK ORIGINAL EQUIPMENT TECHNOLOGY Antifreeze + Coolant 50/50 Prediluted for North American Vehicles - ORANGE (manufacturer page)
- PEAK: PEAK ORIGINAL EQUIPMENT TECHNOLOGY Antifreeze + Coolant 50/50 Prediluted for North American Vehicles - YELLOW (manufacturer page)