Motorcraft VC-13-G Yellow Concentrated Antifreeze/Coolant

This is Ford's current yellow coolant meeting Ford specification WSS-M97B57-A1 or WSS-M97B57-A2, the P-OAT (Phosphated Organic Acid Technology) formula used across most Ford, Lincoln, and Mercury vehicles built since roughly 2018. Check your owner's manual or the coolant fill cap before buying, since Ford has used several distinct coolant chemistries across model years and platforms.

Yes. Ford's own service documentation treats yellow WSS-M97B57 coolant as chemically compatible with the older orange WSS-M97B44-D coolant it replaced, and approves using yellow to top off or fully replace a system originally filled with orange. Mixing the two resets the service interval to the shorter orange-coolant schedule rather than the longer yellow one, so a full flush is worth doing if you want the extended interval.

No. This P-OAT formula, the NOAT-based Gold line, and the older conventional green line are three distinct Motorcraft coolant chemistries, and Ford's literature says not to mix or top off a system originally filled with a different coolant line. Use the coolant your specific vehicle was built to take, not whichever Motorcraft bottle is on the shelf.

Yes. This is a full-strength concentrate, not a ready-to-use product. Ford's label and SDS both describe it as requiring dilution with distilled water, typically 50/50, before it goes into the cooling system. Pouring it in neat gives a higher freeze point and worse heat transfer than a properly diluted mix.

The DANGER signal word comes from a Category 1 organ-damage classification, naming the respiratory system, heart, kidneys, and central nervous system, on both single and repeated exposure, tied to the ethylene glycol base. The standard harmful-if-swallowed classification most EG coolants carry also applies, and California's Proposition 65 warning traces to the same ethylene glycol content. This is a real chemistry classification from the manufacturer's own safety data sheet, not marketing language.

The listing for Motorcraft VC-13-G Yellow Concentrated Antifreeze/Coolant carries a California Prop 65 warning. Motorcraft VC-13-G Yellow Concentrated Antifreeze/Coolant is a working automotive fluid rather than a passive part, so the warning points at the formulation itself. The manufacturer's Safety Data Sheet is the primary source for what is in it: the hazard classification and the PPE tiers on this page are translated from that sheet, and the full SDS is linked from the safety panel. California requires the warning whenever exposure to any of roughly 900 listed substances is possible. It does not name which substance applies to a given product, and it states no dose or risk level, so it is not on its own a measure of how hazardous this fluid is in normal use.