Engine Coolant – 1 gal – GM (12378560)

Engine Coolant – 1 gal is a lubricant or hydraulic fluid built to a manufacturer specification rather than to a generic grade. The specification is what determines friction modifier content and cold-flow behaviour.

Change the Engine Coolant gal when the fluid has darkened or smells burnt, when a repair has exposed the circuit, or when the specified interval has passed. Topping up a different specification is worse than running low.

This Engine Coolant gal is listed as part 12378560 (Reservoirs & Thermostats). Where a number has been superseded, the current reference is the one that ships, so check any supersession note before ordering.

Genuine GM supplied for this Engine Coolant gal, with the engineering number unchanged from the factory reference stamped on the original.