The FleetGuard Lube Filter is a high-quality lubricant designed to protect your engine from harmful contaminants. This product is specifically designed to fit Bluebird and Chevrolet engines. This lubricant is engineered to prevent contaminants from entering the engine, which can cause damage and reduce performance. By using FleetGuard Lube, you can improve your engine's performance, reduce wear and tear, and extend the lifespan of your engine. With a BPV setting of 13.5 psi and a largest OD of 93.13 mm , this product is built to withstand the toughest conditions and provide reliable protection for your engine. FleetPride is your First Click in Heavy Duty®.