Typical manufacturer’s oil fill caps that are made from plastic are know to fail and leak oil all over. Due to vibration and inferior engineering, low-quality oil fill caps have been know to come loose and fall off while driving down the road. Don’t get caught in a bind! Performance Diesel’s BIG BOSS? Oil Fill Caps are carved from solid, high-grade billet aluminum for longevity and superior performance over typical stock oil fill caps.
Our Oil Fill Caps are structurally superior with a lock-tight design which has been field tested for strength and security.