BMW M2 N55/S55 Performance Engine ReplacementRebuilt & Options

A BMW M2 replacement engine typically costs £3,200-£10,500 supply-only, depending on engine code (N55, S55 or S58) and condition type.

• N55 M2 (2016-2018): rebuilt units £3,200-£6,800
• S55 M2 Competition (2018-2021): rebuilt units £4,500-£8,500
• S55 M2 CS (2020-2021): rebuilt units £5,500-£10,000
• S58 G87 M2 (2023-present): rebuilt units £5,500-£10,500
• Add £600-£1,200 for specialist supply and fit nationwide

Yes - the S55 crank hub spin is the most documented failure on M2 Competition and CS models, affecting both stock and tuned cars between 20,000-60,000 miles .

• OE design lacks a physical keyway - hub held by friction only
• Aggressive downshifts or high-rpm launches can cause timing slip
• Preventative pinned or captured hub fix costs £1,800-£2,500 fitted
• Post-failure repair often requires full engine replacement at £7,500+
• G87 S58 engine uses redesigned single-piece hub - issue resolved

On the 2016-2018 N55-powered M2, the most common failures are cracked charge pipes (sudden boost loss and limp mode), ignition coil misfires, and oil leaks from ageing gaskets .

• Plastic charge pipe cracks under boost - upgraded aluminium pipe is permanent fix
• Ignition coil failure causes hesitation and rough idle - £170 average replacement
• Valve cover and oil filter housing gaskets leak - £200-£350 repair
• Electric water pump failure can cause overheating - £327 average replacement
• VANOS solenoid wear affects cam timing on higher-mileage units

The S58 in the G87 M2 is mechanically the most robust, having resolved the S55's crank hub vulnerability. The N55 is reliable with one cheap preventative fix, while the S55 needs a crank hub upgrade for peace of mind .

• S58 (G87): single-piece crank hub, closed-deck block, excellent tuning potential
• N55 (F87): reliable if charge pipe upgraded to aluminium (£400-£550)
• S55 (Competition/CS): fundamentally strong but crank hub fix is essential
• All three engines regularly exceed 100,000 miles with proper maintenance
• G87 still too new for long-term failure data, early signs positive

Yes - all three M2 engines respond well to tuning, but the S55 requires a crank hub fix before adding power. The S58 offers substantial gains with proper supporting mods .

• N55: stage 1 remap safe with aluminium charge pipe fitted
• S55: DO NOT tune without pinned crank hub - stock cars already spin hubs
• S58: highly tunable - 500-600+ hp achievable with software and bolt-ons
• Always use a specialist BMW tuner, not a generic remap
• Factor in upgraded cooling for track use

A well-maintained BMW M2 engine typically lasts 100,000-150,000 miles. The N55 and S55 need preventative fixes around 50,000-80,000 miles to reach higher mileage reliably .

• N55: charge pipe upgrade by 60,000 miles prevents cascade failures
• S55: crank hub fix recommended by 50,000 miles or before tuning
• Regular oil changes every 5,000-6,000 miles (not BMW's 12,000-mile interval)
• Track use significantly accelerates wear - more frequent servicing required
• Many F87 M2s now exceeding 80,000 miles on original engines

On an F87 M2 worth £18,000-£45,000, spending £4,000-£9,000 on a rebuilt engine with upgraded components is financially sensible compared to selling with a failed engine.

• Car with failed engine loses 40-60% of market value
• Rebuilt N55: £3,200-£6,800 - adds 80,000+ miles of life
• Rebuilt S55 with crank hub fix: £4,500-£8,500 - eliminates factory weakness
• Specialist rebuild includes upgraded components and 12-24 month warranty
• Lower cost than £12,000-£16,000 dealer replacement or buying another M2

Ageing gaskets - particularly the valve cover, oil filter housing and oil pan - are the primary cause of oil leaks on the F87 M2, typically appearing from 50,000 miles onward .

• Valve cover gasket leak (£200-£350) - burning oil smell most common sign
• Oil filter housing gasket failure can contaminate serpentine belt
• Oil pan gasket leak requires subframe lowering - higher labour cost
• Ignoring leaks leads to low oil pressure and potential engine failure
• G87 too new for gasket age-related issues

Rebuilt engines are fully disassembled and machined with new parts - the premium choice. Reconditioned means inspected and worn parts replaced to factory spec. Used engines are tested donor units with existing mileage .

• Rebuilt: fully machined, new pistons/rings/bearings, upgraded failure points - £4,200-£9,500
• Reconditioned: factory-spec rebuild with OEM parts - £3,800-£7,500
• Used: tested donor engine, lowest cost but unknown history - £2,500-£5,500
• Remanufactured: 'better than new' with blueprinted assembly - £5,000-£11,000
• All types include 12-24 month warranty when sourced through our network

For routine maintenance either works, but for engine replacement or S55 crank hub work, a BMW specialist offers better value - typically 30-50% lower labour rates and proven experience with M engines .

• Dealer labour: £150-£250/hour - OEM parts only
• Specialist labour: £70-£120/hour - can fit upgraded parts like pinned hubs
• Specialists often offer supply & fit packages with combined warranty
• Many specialists have direct S55 crank hub fix experience - dealers may not
• Our network connects you with vetted UK BMW M2 specialists