Castrol Transmax Axle Long Life Oil 75W-90 Castrol Transmax Axle Long Life 75W-90, formulated with Smooth Drive Technology TM, is a fully synthetic rear axle fluid. It provides superior protection, especially when driving in stop-start or extreme conditions. This allows for smoother axle operation and noise reduction, resulting in a more comfortable ride for the life of the vehicle. Specially designed and approved by BMW for use in all BMW final drives equipped with conventional (not limited slide) differentials. It is Castrol's primary recommendation for final drives in heavy commercial vehicles, and is approved by MAN, Scania and ZF. Fuel economy and emission reduction due to balanced viscometry and friction. Superior pumpability due to low temperature fluidity ensures optimum protection and starting under all circumstances. Its excellent thermal and oxidative stability provides cleanliness of the final drive and differential which allows to extend the service service interval and reduces maintenance. Optimum anti-wear and extreme pressure (EP) performance in all ambient temperature and load conditions. Excellent temperature reduction and shear stability increases final drive performance and extends component life.