SAE 75W-90, API GL-5 is the primary service fill rear axle oil for many passenger cars and trucks. SUVs and Trucks in particular may be equipped with limited slip differentials. Pennzoil Platinum Axle 75W-90 contains sufficient limited slip friction modifier for many applications. Newer applications however may require an additional limited slip friction modifier. Pennzoil Platinum Axle 75W-90 is fully compatible with additional f