GL-5 Gear OIls are formulated for severe service conditions and environments in cars, trucks and heavy equipment. They provide excellent load carrying capability, wear resistance, oxidation stability, anti-rust, anti-corrosion and anti-foam properties. These lubricants contain sulfur and phosphorus additive materials, but no zinc, in compliance with most manufacturers requirements for truck driving axles. High quality base oils, strict quality assurance with our in-house lab and testing facilities, and the latest in premium additive technology, make Super S GL-5 the best choice.