This rear differential oil service kit is used by BMW for limited slip differentials.
 
Service kit:
Genuine BMW Hypoid axle oil G4 0.5L - 83222447362 x 2
Genuine BMW Screw plug with O-ring M22X1,5 - 33117525064 x 2 
Rear differential fluid, also known as differential oil, is a lubricant specifically designed for the differential of a vehicle. The differential is a crucial component in the drivetrain that allows the wheels to rotate at different speeds, particularly when the vehicle is turning. The fluid helps in several ways:
Lubrication: It reduces friction between the moving parts within the differential, such as gears and bearings.
Cooling: It helps to dissipate heat generated from the friction and the operation of the differential.
Protection: It prevents wear and tear of the gears and bearings, extending the lifespan of the differential.
Performance: It ensures smooth and efficient operation of the differential, contributing to overall vehicle performance and handling.
The fluid needs to be changed periodically as part of regular vehicle maintenance to ensure optimal performance and to prevent potential damage to the differential components.
 
Disclaimer:
Product image is for illustrative purposes only. Actual contents and appearance may vary depending on vehicle specification and manufacturer supply.