GP-1 15w40 SemiSynthetic Case 12 x 1 Quart

The GP-1 15W40 SemiSynthetic Case 12 x 1 Quart from DRIVEN RACING OIL is purpose-built for street and light-duty racing applications where traditional mineral oils fall short of thermal stability demands. This semi-synthetic formulation bridges the gap between conventional and full synthetic protection, making it an ideal choice for modified engines, weekend warriors, and performance enthusiasts who demand reliable lubrication without breaking the budget. Whether you're running a naturally aspirated stroker or a boosted platform, this oil handles the abuse of aggressive driving cycles while maintaining film strength under sustained high RPM operation.

The 15W40 viscosity rating delivers excellent cold-start pumpability—critical for early morning startups—while the elevated 40-weight base maintains a protective boundary layer once the engine reaches operating temperature. DRIVEN's semi-synthetic blend incorporates synthetic base stocks that resist thermal breakdown far better than conventional mineral oils, allowing the film to hold up under the extreme shear forces found in modern engine designs with tight tolerances and variable valve timing systems. The additive package includes anti-wear protection, detergents to prevent carbon buildup, and oxidation inhibitors that extend drain intervals compared to conventional alternatives—a real advantage if you're pushing your engine hard at the track or on spirited road courses.

This case of twelve 1-quart bottles is perfect for racers and serious enthusiasts who perform their own oil changes and need to keep supply on hand for multiple vehicles or frequent change cycles. The individual quart format allows flexible top-ups between full drains, eliminating the hassle of managing large bulk containers in a home garage or shop environment. Compatibility spans most American V8s, import performance platforms, and marine engines where an SAE 15W40 specification is called for—verify your engine manufacturer's recommendations before use, as some newer vehicles specify lower viscosity synthetics.