BMW Garage
BMW M-Power Engine Rebuild
Specialist rebuilds for BMW M-division engines — S54, S55, S58, S62, S63, S65, S85, S68. Full strip-down, precision assembly, and comprehensive testing.
15+ yrs
BMW specialists
1,800+
engines rebuilt
12 mo
unlimited-mileage warranty
What This Service Involves
M-Power engine rebuilding is the specialist process of rebuilding BMW's high-performance M-division engines. These S-code engines are built to tighter tolerances, produce significantly more power, and incorporate advanced systems not found on standard BMW engines. Every M-Power rebuild at our workshop follows a documented, repeatable process designed to restore the engine to its original performance specification.
We carry out M-Power rebuilds on the full range of S-code engines, including the S54 (E46 M3, Z4 M), S55 (F80 M3, F82 M4, F87 M2 Competition), S58 (G80 M3, G82 M4, G87 M2, X3 M/X4 M), S62 (E39 M5), S63 (F10 M5, F90 M5, M6, M8, X5 M/X6 M), S65 (E90/E92/E93 M3), S85 (E60 M5, E63/E64 M6), and S68 (XM, G90 M5).
Starting Price
Performance V10/V8 (S85/S63/S68): from £6,500 Performance 6-Cyl (S54/S55/S58/S65): from £5,500
Prices are starting from, inclusive of full rebuild with new OEM-spec components, machining, and testing. Final quote confirmed after inspection.
Inside our workshop
BMW M-Power Engine Rebuild
Our M-Power Rebuild Process
- 01
Complete disassembly with careful documentation of every component's condition, orientation, and clearances.
- 02
Every component measured against M-specification tolerances. Crankshaft assessment is critical, as M crankshafts are specific and expensive.
- 03
Precision cylinder boring/honing, crankshaft grinding, and block surface preparation to exact M specifications.
- 04
Replacement of bearings (e.g., S54/S65/S85 rod bearings) and timing systems (chains, tensioners, VANOS).
- 05
Assembly using M-specification torque procedures and BMW M-specialist tooling, following TIS documentation.
- 06
Compression, pressure, and performance checks on a test stand, followed by in-vehicle road testing to verify operation.
Why Choose Us
- Specialist M-Power rebuilds since 2009
- Full access to BMW M technical information (TIS)
- Clean assembly area and precision measuring equipment
- M-specification torque procedures and specialist tooling
- Comprehensive testing on every rebuild
- 12-month unlimited mileage warranty
How It Works
- 01
Call, email, or use the quote form with your vehicle details.
- 02
We inspect your engine and provide a detailed quote.
- 03
We carry out the rebuild using M-specification procedures.
- 04
Engine is tested and your vehicle returned.
Frequently Asked Questions
What makes an M-Power rebuild different from a standard BMW engine rebuild?+
M-Power engines (S-code) have tighter tolerances, more complex systems (individual throttle bodies, advanced VANOS), and require M-specific tooling and parts. Our rebuild process follows BMW M technical information (TIS) with specific torque and assembly procedures.
Which M-Power engines do you rebuild?+
We rebuild S54, S55, S58, S62, S63, S65, S85, and S68 engines, covering the full range of M models including M2, M3, M4, M5, M6, M8, X3 M, X4 M, X5 M, X6 M, and XM.
Do you replace rod bearings on S54/S65/S85 engines?+
Yes. Rod bearing replacement is a standard part of our rebuild process for these engines, as it's a known requirement to restore reliability and performance.
Do you inspect the crank hub on S55 engines?+
Yes. For S55 engines (F80 M3, F82 M4, F87 M2 Competition), crank hub inspection and replacement is a standard part of our rebuild process to address the known press-fit friction design.
How long does an M-Power rebuild take?+
Typical turnaround is 3-5 working days for a full rebuild, depending on the extent of the work and parts availability. This is standard across our engine rebuild services.