It is important to give your engine the best care by supplying our U1P-DUTY SAE 40 Heavy-Duty Conventional Motor Oil, API CF. This oil is blended with paraffinic base oils and additives. Formulated with 100% virgin paraffinic base stock combined with an Ultra-premium additive package, this oil contains anti-wear, antioxidant, anti-foaming, detergent, and dispersant agents, delivering strong lubricant film performance and high temperature viscosity stability for anti-wear protection in a wide range of heavy-duty applications. When you upgrade to U1P, there are no special procedures needed. This oil exceeds the performance requirements of API CF. 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.