BMW S63 V8 — The M5/M8 Twin-Turbo V8

Overview

The S63 is BMW M's 4.4-liter twin-turbocharged V8, used in M5, M6, M8, X5 M, and X6 M from 2009 onwards. It's the hot-vee successor to the S85 V10.

Specifications (S63B44T4 — F90 M5 Competition):

• Displacement: 4,395 cc
• Power: 625 hp @ 6,000 rpm
• Torque: 750 Nm @ 1,800-5,860 rpm
• Turbochargers: Twin Mitsubishi TD04-25T (hot-vee)
• Redline: 7,200 rpm

Revisions

• S63T0 (2009-2013): E70 X5 M, E71 X6 M — 555 hp
• S63T1 (2011-2016): F10 M5, F06/F12/F13 M6 — 560 hp
• S63T2 (2014-2016): F10 M5 Competition — 575 hp
• S63T3 (2017-2019): F90 M5 — 600 hp
• S63T4 (2018-2023): F90 M5 Competition, F92 M8 — 625 hp

Hot-Vee Design

Like the N63, the S63 places turbos inside the V. M division optimized the cooling and oiling to handle the extreme heat.

Known Issues

• Oil consumption — some units consume oil
• Turbo oil line leaks
• Coolant system maintenance critical
• Rod bearing concerns (less documented than S65 but monitor oil analysis)

Tuning

Stage	Power	Torque
Stock Comp	625 hp	750 Nm
Stage 1	720-750 hp	900-950 Nm
Stage 2	800-850 hp	1,000+ Nm

The S63 is BMW M's most powerful production V8 — a true super sedan engine.