Visco with CleanGuard™ engine protection technology keeps your engine cleaner for longer. Your car runs better if the engine is kept clean. CleanGuard™ technology keeps your engine clean by preventing dirt such as carbon and sludge from sticking to sensitive engine parts and the vital oil ways. CleanGuard™ technology slows down the formation of carbon and sludge and wraps up dirt so that it doesn’t stick to the engine.