Common Problems with the
2025–2026 BMW M4

Buying Tips for 2025–2026 BMW M4

• Check for signs of aftermarket tuning (bootmod3, piggyback ECUs); tuned cars place immense stress on the infamous S55 crank hub.
• Inspect the carbon-ceramic brakes (if optioned; indicated by gold calipers) for chipping on the rotor edges; replacement discs cost roughly £4,000 per axle.
• Verify the front radiators and oil coolers for stone damage; the large grilles leave them exposed to debris on UK motorways.
• Look closely at the panel gaps and paint finish; M4s are frequently involved in accidents, so check for hidden crash damage.
• Test the 7-speed DCT gearbox; it should shift with brutal speed in the highest setting, but check for leaks from the transmission pan.
• Ensure the differential bushes aren't completely worn out, which causes a heavy clunk from the rear end when accelerating hard.