XP4 15w50 Conventional Oil Case 12 x 1 Quart

The XP4 15W50 Conventional Oil Case is designed for street and track vehicles that require reliable lubrication and viscosity stability across a wide temperature range. This oil is particularly beneficial for drivers and mechanics who prioritize engine longevity and performance, especially in modified engines that operate under higher temperatures or tighter tolerances.

The XP4 formulation utilizes a conventional base stock engineered to maintain viscosity stability during cold starts and high-load conditions. With a 15W50 weight, it offers a 15-weight pour point for reliable cold-start flow and a full 50-weight film strength at operating temperature, which is essential for protecting critical engine components under acceleration.

This oil is ideal for naturally aspirated and carbureted engines, particularly in vintage V8s and older muscle cars, where synthetic oils may cause seal-swell issues. The 15W50 viscosity is well-suited for warm climates, ensuring optimal performance and protection for engines that demand conventional oil formulations.