Use the following procedure to check and top up Supercharger oil (W11 engine).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 ; one on the front of the super charger supercharger below the drive pulley . One and one on the rear behind the water pump. Each Oil service for each is covered separately.MINI W11 engine uses an Eaton supercharger. MINi does not recommend oil services, therefore no oil is available through MINI parts. General Motors uses a similiar Eaton supercharger and their oil can be substituted. GM Part numer 12345982. 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. 
checking - Remove engine oil dipstick tube.
- Using a 3/16 allen Allen wrench remove oil fill plug (inset).
- Oil should run out of supercharger when fill plug is removed. If it does not, fill oil reservoir until oil starts Fill reservoir with oil until it begins to run out of fill hole. (arrow).
- Reinstall plug and tighten.
checking - Remove water pump. See 170 Radiator and Cooling System.
- Using a 3/16 allen Allen wrench remove oil fill plug (arrow).
Supercharger removed from vehicle for clarity - Oil level should run out of supercharger when plug is removed. If it does not, fill oil reservoir until oil starts Fill reservoir with oil until it begins to run out of fill hole. (arrow).
- Reinstall plug and tighten.
MINI Repair & Technical Literature: http://www.bentleypublishers.com/mini/ | 
