According to Rislone, its engine cleaner has been continually used by race clubs because of how well it keeps the sludge and carbon build-up out of its motors. Rislone uses high-quality oil combined with special additives that work in unison to keep the engines running clean.
The ingredients in Rislone engine treatment are made to flow through piston rings, bearings surfaces and valve seats. The additives loosen any varnish or sludge that may have accumulated inside the engine and deposits them into the oil pan. Once deposited, the sludge then sits there until drained during the vehicle's next oil change. One bottle of Rislone is able to treat between 4 to 6 quarts of oil.