The Eaton M45 supercharger provides the boost pressure and characteristic immediate power delivery in the MINI R52 Cooper S and R53. Inside, gears, shafts and bearings operate with separate oil fills. As the supercharger ages and the mileage increases, the oil may lose its lubricating properties. Timely servicing helps identify wear at an early stage and keep the supercharger operating reliably for as long as possible.
Why does the Eaton M45 supercharger need servicing?
Supercharger servicing is often not included in the regular maintenance schedule and is therefore neglected for many years on some vehicles. However, this does not mean that the oil and mechanical components are unaffected by wear.
- Supercharger oil ages: Heat, mileage and mechanical loads can reduce the oil’s lubricating properties over time.
- Two oil fills lubricate the mechanism: Both sections of the Eaton M45 supercharger are included during the service.
- Bearings and shafts are subjected to load: Stiff movement, play or unusual noises may indicate developing wear.
- Related components also age: The supercharger belt, tensioner, pulleys, seals and water-pump drive should be inspected at the same time.
When is a supercharger service advisable?
Depending on the mileage, age and previous maintenance, we recommend a supercharger service approximately every 80,000 to 100,000 kilometres. If the maintenance history is unknown, an inspection is also advisable even when there are no obvious problems.
- The previous service is unknown: The supercharger oil has never been replaced in many MINI R52 Cooper S and R53 models.
- Unusual noises occur: Rattling, grinding or other mechanical noises from the supercharger area should be investigated promptly.
- The power delivery changes: Noticeable power loss or uneven power delivery can have various causes and should be diagnosed.
- Work on the belt drive is required: If the belt, tensioner or pulleys need replacement, it may be sensible to inspect the condition of the supercharger at the same time.
How the supercharger service is performed
The supercharger is removed from the vehicle for a complete service. This allows both oil fills to be replaced and the mechanical components and related parts to be inspected properly.
- Remove the supercharger professionally
- Replace both oil fills in the Eaton M45 supercharger
- Inspect the bearings, shafts and mechanism for smooth movement, play and unusual noises
- Inspect the supercharger belt, tensioner and idler pulleys
- Inspect the water-pump drive and the visible condition of the water pump
- Inspect seals, connections and visible damage
- Replace seals and other worn components after consultation
- Reinstall the supercharger professionally
- Read the fault memory and check engine operation and supercharger function
- Carry out a final test drive
What you should know beforehand
A supercharger service is not an overhaul: We replace the oil and inspect the mechanical condition, but we do not overhaul the supercharger itself. Fresh oil cannot repair damaged bearings, gears, shafts or sealing surfaces.
If we discover significant damage during removal, we discuss the next step with you. Subject to availability, we can offer a good used Eaton M45 supercharger from our shop. The replacement part and additional work are not included in the price of the supercharger service.
Time and cost: A supercharger service usually takes around three hours and costs from 399 €. Additional seals, worn components or a required replacement supercharger are charged separately and discussed with you beforehand.
Request a supercharger service
Please include the vehicle details, mileage and any unusual noises or changes in power delivery in your appointment request. This helps us prepare the appointment and any parts that may be required.