With modern cars and conditions, oil stays in engines longer and works harder than ever before, which creates damaging sludge. Don't put clean oil into a dirty engine; use SCA Engine Oil Flush to remove damaging sludge deposits and extend the life of your engine. Simply add to the existing engine oil of a stopped, warm engine. Turn the vehicle back on and let it idle for 15 minutes. After this time, turn off the engine again and drain the old oil. Change the vehicle oil filter and re-fill oil per manufacturer directions.