Blue Devil Radiator Flush & Oil Degreaser (32 oz)

Oil contamination in a cooling system — whether from a leaking head gasket, a failed oil cooler, or a transmission cooler breach — coats surfaces with a film that insulates against heat transfer and clogs small passages. Regular scale and rust buildup does the same thing over time. Blue Devil Radiator Flush and Oil Degreaser is a concentrated cleaner formulated to strip all of that out in a single flush cycle.

The 32 oz bottle treats the cooling system by removing scale, grease, oil, rust, and general deposits that accumulate over years of use. Blue Devil formulates this to be compatible with all types of antifreeze and safe for all cooling system components — hoses, gaskets, water pumps, and radiator cores included. Restoring a clean cooling system helps the engine shed heat the way it was designed to, which is the entire point of flushing.

Pour it in, run the engine to circulate it through the system, drain, and refill with fresh coolant. It is a straightforward job with basic tools and a drain pan.