It is important to give your engine the best care by supplying our U1P-Duty SAE 50 Heavy-Duty Motor Oil API CF. This oil is blended with premium paraffinic base oils Group II and advanced additives technology for high performance and an enhanced engine life. This oil contains anti-wear, antioxidant, anti-foaming, detergent, and dispersant agents. When you upgrade to U1P, there are no special procedures needed. Ultra1Plus™ motor oil is fully compatible with conventional or other synthetic oils. One quart is formulated to meet the demands of the highest performance and modified engines. This oil exceeds the performance requirements of API CF and the stringent lubricating performance requirements of American, European, Korean, Japanese, and other worldwide engine manufacturers. Remember always refer to your vehicles operating manual to select the correct grade oil for your engine.