The BMW S65 is a V8 DOHC piston engine which replaced the (straight-6) S54 and was produced from 2007–2013.
Derived from the BMW S85 V10 engine used in the M5/M6, it shares the same basic architecture and aluminium construction. It was introduced in the E92 M3 and was chosen as International Engine of the Year for the 3.0 to 4.0 L category in 2008, 2009, 2010, 2011, and 2012.
3,998 cc (244 cu in)
309 kW (414 hp) @ 8300
400 N·m (300 lb·ft) @ 3900
4,361 cc (266 cu in)
331 kW (444 hp) @ 8300
440 N·m (320 lb·ft) @ 3750
2008 to 2013 BMW M3 E90/92/93 sedan/coupe/convertible Engine specification
400 Nm, 295 ft-lb
Euro Emissions Standard
Miles Per Tank
2008-2013 BMW M3 E90/92/93 sedan/coupe/convertible
2009-2014 Wiesmann MF4-S GT/Roadster
2010-2011 E92 M3 GTS coupe
2011 E90 M3 CRT
2011 BMW Z4 GTE (non-production)
2011 BMW Z4 GT3 (non-production)
The S65 engine was developed due to its S54 predecessor having reached the end of its development potential and being unable to meet increasingly stringent Euro V and California Air Resources Board (CARB) emissions regulations.
4.0 L (3,999 cc)
Cylinder block alloy
Cylinder head alloy
309 kilowatts (414 hp)
400 N·m (295 lb·ft)
The S65 shares the same 92 mm (3.6 in) bore and 75.2 mm (3.0 in) stroke cylinder dimensions with the S85 V10, along with the Double-VANOS variable valve timing system and 12.0:1 compression ratio.
A wet-sump lubrication system with an oil return pump and a main oil pump replaces the three-pump wet-sump system used on the V10, further decreasing weight.The alternator disconnects from the engine during acceleration to maximise power, only charging the battery during braking and decelerating whenever possible, in a system BMW calls Brake Energy Regeneration.
An updated version of the Siemens MSS65 ECU (used in the S85 V10) is fitted to the V8. Claimed to be capable of more than 200 million calculations per second, the new ECU (known as the MSS60) comfortably exceeds the 25 million calculations of which the S54's ECU was capable. The MSS60 was actually produced before the MSS65 control unit, although it was not put into production vehicles until the M3 in 2007. The newer M3 control units are manufactured by Continental and are no longer labeled Siemens.
The resulting engine weighs 202 kg (445 lb): 15 kg (33 lb) lighter than the straight-6 engine it replaces, while also being shorter.
The firing order for the S65 engine is 1-5-4-8-7-2-6-3, which is different from the typical BMW V8 firing order of 1-5-4-8-6-3-7-2