Metalophilic MP-5 oil Prevents rust & corrosion 4 oz. Air Venturi Metalophilic MP-5oil penetrates the smallest crevices of your airgun and protects against corrosion and rust. This oil neutralizes sweat and salt and doesn't trap moisture. This oil eventually dries into a non-gumming, lubricating film which lasts through almost indefinite storage. Extend the life of your airgun and pick up this rust inhibiting oil today! Do NOT use Metalophilic MP-5 oil in the compression chamber of spring-piston airguns.