BMW S85 V10 Head Gasket Keychain - M5 E60 M6 E63 Stainless Memento

This stainless-steel head gasket keychain celebrates the BMW S85B50, BMW M’s naturally aspirated 5.0-litre V10. Produced from 2005 to 2010, it powered the E60/E61 M5 and E63/E64 M6 with 507 PS, 520 Nm and an 8,250 rpm redline.

Engine Identity

Manufacturer: BMW M GmbH.
Engine code: S85B50.
Configuration: Front-mounted, longitudinal, naturally aspirated 90-degree V10 petrol engine.
Cylinder count: 10
Displacement: 4,999 cc / 5.0 litres / 305.1 cubic inches.
Production period: 2005–2010.
Valvetrain: DOHC, four valves per cylinder and 40 valves in total, with Double VANOS variable cam timing on inlet and exhaust camshafts.
Induction and intake: Naturally aspirated, with electronically actuated individual throttle bodies.
Construction: Aluminium cylinder block and cylinder heads.

The S85B50 was BMW M’s first and only production V10 engine, succeeding the S62 V8 in the M5. Its 92.0 mm bore and short 75.2 mm stroke contribute to its oversquare, high-revving design.

Vehicle Compatibility Matrix

Engine	Vehicle	Chassis	Model years	Factory output
S85B50	BMW M5 Saloon	E60	2005–2010	507 PS / 373 kW at 7,750 rpm; 520 Nm at 6,100 rpm.
S85B50	BMW M5 Touring	E61	2005–2010	507 PS / 373 kW at 7,750 rpm; 520 Nm at 6,100 rpm.
S85B50	BMW M6 Coupé	E63	2005–2010	507 PS / 373 kW at 7,750 rpm; 520 Nm at 6,100 rpm.
S85B50	BMW M6 Convertible	E64	2006–2010	507 PS / 373 kW at 7,750 rpm; 520 Nm at 6,100 rpm.

The S85B50 was not factory-fitted to an M3 or other mainstream BMW road car. Its road-car applications were limited to the E60/E61 M5 and E63/E64 M6.

Why This Engine Matters

The S85B50 was developed during BMW M’s Formula One V10 era and gave the E60 M5 and E63/E64 M6 an unusually exotic engine configuration for executive and grand-touring cars. It produced 507 PS at 7,750 rpm—more than 100 PS per litre—without turbocharging or supercharging.

Its ten individual throttle bodies, high 12.0:1 compression ratio, Double VANOS and 8,250 rpm redline give the S85 its distinctive sharp throttle response and high-rpm V10 sound. For many enthusiasts, it remains the defining engine of the E60 M5 and E63 M6 generation.

Technical Specifications

Specification	BMW S85B50
Capacity	4,999 cc / 5.0 litres.
Configuration	Naturally aspirated 90-degree V10 petrol engine.
Cylinder head	DOHC, four valves per cylinder; 40 valves total.
Block and head material	Aluminium
Bore x stroke	92.0 x 75.2 mm
Compression ratio	12.0:1
Valvetrain	Double VANOS continuously variable inlet- and exhaust-cam timing.
Throttle system	Ten electronically actuated individual throttle bodies.
Peak power	373 kW / 507 PS / 500 hp at 7,750 rpm
Peak torque	520 Nm at 6,100 rpm
Maximum engine speed	8,250 rpm
Specific output	74.6 kW per litre / approximately 101 PS per litre.
Engine mass	Approximately 240 kg.
Recommended oil	10W-60; quoted capacity is 9.3 litres in independent technical references.

Power and torque data above refer to the standard European-rated S85B50. Market-specific literature may express the same output as 500 hp or 507 PS, which are different measurement conventions rather than different engine calibrations.

Product Details

Stainless-steel head gasket keychain inspired by the BMW S85B50 5.0-litre V10 cylinder-head gasket profile.
Designed for owners and enthusiasts of the E60 M5, E61 M5 Touring, E63 M6 and E64 M6 Convertible.
Finished using our three-stage vibratory polishing process for a smooth, durable metal finish.
Supplied on a plywood display card for gifting, collecting or display.
A compact tribute to BMW M’s 507 PS, 8,250 rpm naturally aspirated V10.

FAQ

What is the BMW S85 engine?

The BMW S85, formally S85B50, is a 4,999 cc naturally aspirated 90-degree V10 petrol engine with DOHC, 40 valves, Double VANOS and individual throttle bodies.

Which cars use the S85B50 engine?

The S85B50 was factory-fitted to the E60 BMW M5 Saloon, E61 M5 Touring, E63 M6 Coupé and E64 M6 Convertible between 2005 and 2010.

How much power does the S85 produce?

The standard S85B50 produces 373 kW / 507 PS at 7,750 rpm and 520 Nm of torque at 6,100 rpm.

Is this a functional replacement head gasket?

No. This is a decorative stainless-steel keychain inspired by the BMW S85 head-gasket shape; it is not an engine-service component.

S85 V10 – BMW M5 & M6 Head Gasket Keychain