🔝 Elevate Your Drive with Red Line Gear Oil! Protect your brass synchros with our non-reactive GL-4 oil. Trust in Red Line's legacy of excellence since 1979. Enjoy quicker, smoother shifts even in the coldest conditions. Perfect for popular models like Nissan 350Z, Mitsubishi Evolution, and more. Experience longer synchro life and superior gear safeguarding. GL-4 compliant 75W85 viscosity Cold climate performance Red Line 50504 MT-85 Manual Transmission 75W85 GL-4 Gear Oil is a high-performance lubricant designed to provide exceptional gear protection and longer synchro life. It is compatible with GL-1, GL-3, and GL-4 applications, ensuring optimal performance for a variety of vehicles, including popular models from Nissan and Mitsubishi. This gear oil offers quicker shifts and is safe for brass synchros, making it a top choice for enthusiasts and professionals alike.