BMW M4 G83

The S58 is 90% a new design compared to the S55 — BMW has addressed most weaknesses of its predecessor. Forged pistons instead of cast, 2 kg lighter crankshaft with integrally forged oil pump and chain drive sprockets, one-piece crank hub from the factory, revised con rod bearings with larger contact area. The closed-deck block is further stiffened and comfortably handles the standard pressure of 1.7 bar. New is the active oil suction system: a separate pump actively draws oil to the critical bearing points during hard cornering, braking and acceleration — the S55's oil-sloshing problem on track is significantly reduced — though not fully eliminated under sustained track abuse. Plus an improved windage tray in the crankcase against oil foaming. Sonically sharper than the S55: less bassy, instead a more metallic, direct roar under load with aggressive overrun crackling in Sport mode. In the CSL with titanium exhaust almost reminiscent of the S65 V8 character. Three points to check: main bearing shell recall (production calendar weeks 29–40/2021) — incorrectly hardened bearings can fail without warning. Proactively swap plastic charge pipes for aluminium units. Walnut blasting every 60,000–80,000 km against intake valve carbon from direct injection. In standard form the most reliable BMW M engine of all time — those who don't tune and observe these three points have 200,000+ km ahead of them.

• !! Oil cooler leaking from stone impact from 40,000 km

  The oil cooler is positioned exposed behind the front grille. Stone impact can damage seals or perforate the cooler itself. Oil loss is a risk.

  Symptoms: Oil patch under the vehicle, oil level warning, oil smell
  800–3,000 $
  Ad BMW S58 oil coolerBMW M3 G80 oil cooler
• !! Connecting rod bearing wear with tuning from 50,000 km

  Like the predecessor S55, connecting rod bearings can wear prematurely, especially with software tuning and track use.

  Symptoms: Knocking from the engine block, oil pressure warning, metallic particles in the oil
  2,000–7,000 $
  Ad BMW S58 connecting rod bearingBMW M3 G80 Lagerschalen
• !! Main bearing shells recall (manufacturing defect 2021)

  BMW recalled G80/G82/G83 M3/M4 vehicles with S58 engines from certain 2021 production weeks. A manufacturing defect in the main bearing shells required complete engine disassembly including crankshaft and oil sump.

  Symptoms: No driver-perceptible symptoms — purely preventive recall. Left untreated, bearing seizure and catastrophic engine failure are at risk.
  0–0 $
  Ad S58 HauptlagerS58 main Lager shellsBMW M3 G80 Lager recall

+ 6 more engine weaknesses + vehicle weaknesses