Use the following procedure to check and top up Supercharger oil (W11 engine).Owing to the extreme heat and harsh operating conditions, it is a good idea to check the supercharger oil level on a regular basis. MINI does not specifically recommend a supercharger oil service and no oil is available through MINI parts. The supercharger on the MINI is manufactured by Eaton. General Motors uses a similar Eaton supercharger and the GM supercharger oil (GM Part number 12345982) can be substituted. The supercharger has two oil reservoirs; one on the front of the supercharger below the drive pulley and one on the rear behind the water pump. Oil service for each is covered separately. The reservoir fill plugs are difficult to access, and some disassembly is required to access the rear plug. A small diameter hose may help to facilitate topping off.W11 engine supercharger has two oil reservoirs. 
- Remove engine oil dipstick tube.
- Using a 3/16 Allen wrench remove oil fill plug (inset).
- Fill reservoir with oil until it begins to run out (arrow).
- Reinstall plug and tighten.
- Remove water pump. See 170 Radiator and Cooling System.
- Using a 3/16 Allen wrench remove oil fill plug (arrow).
Supercharger removed from vehicle for clarity - Fill reservoir with oil until it begins to run out (arrow).
- Reinstall plug and tighten.
MINI Repair & Technical Literature: http://www.bentleypublishers.com/mini/ | 
