BMW S58 Engine — The G80 M3/M4 Twin-Turbo Powerhouse

Overview

The S58 is BMW M's latest 3.0-liter twin-turbocharged inline-six, debuting in the X3M/X4M (2019) and then the G80 M3/G82 M4 (2021). It's based on the B58 architecture but extensively reworked by M division.

Specifications:

• Displacement: 2,993 cc
• Bore x Stroke: 84.0 mm × 90.0 mm
• Compression: 9.3:1
• Power: 473 hp (standard) / 510 hp (Competition)
• Torque: 550 Nm (standard) / 650 Nm (Competition)
• Turbochargers: Twin Mitsubishi TD04-22T
• Redline: 7,200 rpm

M Division Upgrades over B58

• Forged crankshaft with cross-drilled oil passages
• Forged connecting rods (lighter, stronger)
• 3D-printed cylinder head bracket (weight optimization)
• Twin turbochargers instead of single twin-scroll
• Closed-deck block with reinforced main bearing caps
• Oil-to-water charge air cooler
• Sodium-filled exhaust valves for better heat management

Key Improvements over S55

• No crank hub issue — the S58 uses a keyed crank hub from factory
• Stronger bottom end — closed-deck B58 base vs open-deck N55 base
• Better cooling — improved oil and coolant circuits
• More power headroom — responds extremely well to tuning

Known Issues (So Far)

The S58 is still relatively new, but early reports include:

1. Oil Consumption

• Some S58s consume 0.5-1L per 5,000 km
• BMW considers up to 1L/1,500 km "normal"
• Monitor oil level regularly

2. Charge Pipe

• Stock plastic charge pipe can crack under increased boost
• Fix: Aftermarket aluminum charge pipe for tuned cars

3. Coolant Hose Connections

• Some reports of coolant weeping from hose connections
• Fix: Re-clamp or replace affected hoses

Tuning Potential

Stage	Power	Torque
Stock Comp	510 hp	650 Nm
Stage 1	600-630 hp	780-820 Nm
Stage 2	680-720 hp	880-920 Nm
Stage 2+ E85	750-800 hp	950+ Nm

The S58 is an absolute monster — it's the most tunable M engine BMW has ever made, with the closed-deck block providing a rock-solid foundation.