30w Racing Oil Cs/12-Qt

PENNGRADE Motor Oil 30W Racing Oil is a conventional mineral-based lubricant engineered specifically for enthusiasts and professional mechanics running naturally aspirated and moderately boosted engines where extreme high-zinc formulations deliver superior wear protection. This 12-quart bulk case (one quart per bottle) is designed for serious track use, vintage engine builds, and performance applications where anti-wear additives become critical during sustained high-RPM operation and shock-loaded valve train conditions.

The 30-weight formulation provides optimal film strength and shear stability across typical ambient operating windows, while the high-zinc additive package—now largely absent from modern street oils due to catalytic converter restrictions—preserves critical boundary lubrication at the cam lobe and lifter interface. Conventional base stock chemistry resists oxidation breakdown during extended heat cycles, preventing sludge accumulation and deposit formation common in carbureted or older fuel-injection systems. The zinc-phosphorus complex sacrificially protects ferrous wear surfaces, reducing micro-spalling during cam ramp acceleration and maintaining viscosity under pressure where cam lobe acceleration rates exceed 10,000 psi localized contact stress.

Buyers restoring Chevrolet small-block and big-block engines, Ford 302/351 platforms, and Mopar mill conversions benefit most from this racing-grade formulation, as OEM flat-tappet and roller-cam engines from the 1960s through 1980s were calibrated for exactly this zinc concentration. The 12-quart case format suits workshop stockpiling and fleet maintenance, eliminating repeated small-bottle purchases across multiple oil change intervals. Not recommended for modern catalytic-converter–equipped vehicles or engines requiring API SN or later classifications; verify your engine's factory recommendation and aftermarket cam manufacturer specifications before switching from detergent street oils.