Slick 50 750002 Recharged High Mileage Engine Treatment, 15-Ounce High Mileage solution to protect against power robbing friction heat and wear Restores performance in engines due to wear and oil consumption in older engines Revitalizes seals to help stop oil leaks and prevent them from ever occuring Powerful detergents to remove and prevent oil sludge, use during your next oil change or between changes to replace lost additive content Powerful detergents to remove and prevent oil sludge, use during your next oil change or between changes to replace lost additive content This product is dispensed in 10W-30 which is a multi-grade oil but is fully compatible with all multi grade motor oils and mono grade oils. It is fully compatible with all conventional, semi-synthetic and full synthetic oil types.