GP-1 10w40 SemiSynthetic Case 4 x 1 Gallon

The GP-1 10W40 SemiSynthetic Case 4 x 1 Gallon from DRIVEN RACING OIL is engineered for serious automotive enthusiasts and mechanics who demand reliable engine protection across a wide range of driving conditions. This four-gallon case delivers the volume needed for routine oil changes, maintenance intervals, and shop stock without multiple smaller purchases. Whether you're maintaining daily drivers, weekend performance builds, or tracking your vehicle, this semi-synthetic formulation bridges the gap between conventional mineral oils and full synthetics, offering superior protection at a practical price point.

DRIVEN RACING OIL's 10W40 viscosity rating provides excellent cold-start flow characteristics while maintaining stable film strength at elevated temperatures—critical for both street and modified engines. The semi-synthetic base stock resists breakdown under thermal stress better than conventional mineral oil, extending drain intervals and protecting critical engine components during sustained acceleration or sustained highway cruising. At 10W40, this oil suits naturally aspirated engines, mild turbocharged applications, and stock to lightly modified powerplants that don't require the thicker 50-weight protection, while the improved oxidation stability ensures consistent performance over the full drain cycle.

Mechanics and DIY builders appreciate the bulk four-gallon format for cost efficiency and convenience during scheduled maintenance or when managing a multi-vehicle garage. This oil is compatible with modern catalytic converters and works well in small-block and big-block engines, import and domestic platforms, and street-driven vehicles where OEM specifications call for 10W40 viscosity. Always consult your owner's manual or engine builder recommendations to confirm viscosity compatibility, particularly with turbocharged or supercharged engines, which may benefit from heavier grades under boost.