BMW M4: common faults & what to check

Which BMW M4 are you looking at?

2 generation variants documented. Pick the shape you recognise: the faults, the servicing and the timeline below all narrow to it. Free, no account needed.

Now narrow it to the engine

A 1.8 and a 2.4 of the same car do not fail the same way, so the faults below narrow to the engine as well as the year. Free, no account needed.

Start your free check on this BMW M4

No plate needed. You get the risk score, the buyer's checklist and the guided inspection for the exact car you picked above — not the whole nameplate.

The checks worth doing on a BMW M4 before you hand over any money. Every documented fault is listed below, each with its own page.

• Serious issue

  Check full service history for oil change intervals and specification.

  See why

  S55 rod and main bearing failure

  The S55 3.0 twin-turbo straight-six in the F82 M4 has a well-documented rod and main bearing failure pattern at higher mileages and following hard or track use. The bearings run tighter clearances than the standard N55, and degraded oil or extended drain intervals cause accelerated wear. Spun or wiped bearings result in catastrophic engine failure. Hundreds of cases are documented on BMW M specialist forums. ACL and King aftermarket bearings at correct clearance are a widely-used preventive measure, often installed proactively at 50,000 to 80,000 km.

  What you would notice

  • Knocking or tapping noise from lower engine under hard acceleration (rod knock)
  • Low oil pressure warning light, particularly under hard cornering or acceleration
  • Sudden loss of power followed by engine seizure in advanced cases
  • Metal particles or shavings visible in oil during a service drain

  Typically $12,000–$28,000 to put right.

• Serious issue

  Verify the VIN against any BMW service actions or TSBs for S58 bearing specification.

  See why

  S58 main bearing failure (early production batch)

  Early production S58 3.0 twin-turbo engines in the G82 M4 were subject to a BMW TSB addressing main bearing clearance tolerance deviations in engines produced during 2020 to 2022. Affected units can develop premature main bearing wear leading to oil pressure loss and potential engine failure. BMW issued revised bearing specifications and a dealer service action for affected VIN ranges. Verify against BMW dealer records before purchasing any early G82 M4.

  What you would notice

  • Low oil pressure warning on cold or hot start
  • Knocking from engine lower end under load or hard acceleration
  • Oil consumption beyond the expected rate
  • Engine failure without audible warning in severe cases

  Typically $10,000–$25,000 to put right.

• Costly issue

  Any detectable play indicates replacement is needed.

  See why

  Front lower control arm ball joint premature wear

  The F82 and G82 M4 share the M-specific front suspension geometry with the M3, and the front lower control arm ball joints are documented to wear prematurely compared to non-M 4 Series models. Higher lateral loads from aggressive driving, wider track and stiffer suspension accelerate ball joint wear. This pattern persists into the G82 generation. Failed ball joints cause vague steering and risk of directional loss in extreme cases.

  What you would notice

  • Clunking noise from front suspension over bumps or during steering inputs
  • Vague or imprecise steering feel
  • Excessive tyre wear on inner or outer edges
  • Wandering or instability at motorway speeds

  Typically $900–$2,200 to put right.

• Costly issue

  Inspect the coolant expansion tank closely for hairline cracks, particularly at the seam and around the pressure cap neck.

  See why

  S55 coolant expansion tank and oil cooler housing crack

  The F82 M4 with the S55 engine uses a plastic coolant expansion tank and a thermoplastic oil cooler housing that are known to crack under thermal cycling, causing coolant loss and potential overheating. The expansion tank plastic becomes brittle with age and heat exposure, developing hairline cracks at the seam and around the cap neck. Separately, the oil cooler thermostatic housing can also crack or develop sealing failures. Both are common on cars over five years old or 80,000 km.

  What you would notice

  • Coolant warning light or low coolant level with no visible puddle undercar
  • Coolant smell from engine bay after a run
  • Visible crack or weeping at coolant expansion tank seam or cap area
  • Overheating if crack advances and coolant loss is significant

  Typically $400–$1,200 to put right.

BMW M4 service schedule

What falls due, and at what distance, for each generation of the BMW M4. These are the model’s intervals — the car’s own service book is the only thing that can tell you what has actually been done to it.

Other BMW models