Nothing works better to clean an oil contaminated cooling system. Just add L-11 to emulsify and dissolve the oil so it can easily be flushed out. Such as a blown head gasket or bad oil cooler. Works with engine oil and transmission fluid. Same formula that was developed by Eskimo Radiator over 50 years ago. Works great on cars, trucks and equipment, gasoline or diesel.
Available in pint and gallon bottles. One pint will treat up to 4 gallons of contaminated coolant.