Description
About This Engine
The BMW S85 is one of the most extraordinary production car engines ever built. Introduced in 2005 in the E60 M5- making it the world's first production sedan with a V10 engine- the S85 was engineered from a clean sheet using BMW's Formula 1 program experience during the Williams-BMW partnership. The block is eutectic aluminum-silicon alloy cast at BMW's Landshut foundry, the same facility and materials used for BMW's F1 engine blocks. Every aspect of the S85's design reflects motorsport engineering principles: the bedplate block construction for exceptional rigidity, 10 individual electronically controlled throttle bodies for instantaneous response, ionic current knock sensing using the spark plugs as sensors, and a semi-dry sump system ensuring consistent oil pressure at 8,250 rpm in any cornering situation.
The S85's 507 hp at 7,750 rpm and 8,250 rpm redline delivered a specific output of 100 hp per liter- among the highest of any naturally aspirated production car engine at the time. The M5 could reach 60 mph in 4.7 seconds with the SMG single-clutch transmission, and the V10's soundtrack from 5,000 rpm through the 8,250 rpm redline is universally described as one of the finest sounds a production car has ever produced. The engine won the International Engine of the Year award 10 times between 2005 and 2010 across multiple categories.
BMW produced the S85 from 2005 through 2010. The S65 V8 used in the E9x M3 (2007 to 2013) was directly derived from the S85 by removing two cylinders and maintaining the same per-cylinder architecture- the same bore, stroke, compression ratio, and DOHC system. The S85 was succeeded by the turbocharged S63 V8 in the F10 M5 (2011 onward), ending BMW's naturally aspirated flagship M car era.
Signs You Need a Replacement Engine
- Rod knock- a deep, rhythmic metallic knock that intensifies with RPM. This is the most serious S85 warning sign. Stop the engine immediately and do not continue driving.
- 10 individual throttle actuator fault codes- rough idle, limp mode, or uneven power delivery. Each throttle body has its own actuator motor subject to gear wear.
- Cold-start VANOS rattle lasting more than a few seconds- VANOS solenoid screen clogging from infrequent oil changes
- Oil consumption above specification- internal seal deterioration on high-mileage examples
- Cooling system seepage- water pump and thermostat housing failure; overheating destroys the aluminum head
- SMG hydraulic pump problems (if equipped)- SMG transmission issue separate from the engine, but closely associated with the E60 M5 ownership experience
Known Problems With This Engine
- Rod bearing premature wear- the S85's most critical and most discussed problem: The S85 rod bearings are sized with insufficient clearance for the engine's high-RPM operating profile. Combined with long oil change intervals using oils thinner than the required 10W-60 specification, rod bearing wear can occur at 50,000 to 80,000 miles. A failed rod bearing destroys the engine completely and without warning. BMW M specialists universally recommend proactive rod bearing replacement at 60,000 to 80,000 miles. We assess for rod knock and oil condition before shipping- any unit showing rod knock is rejected before listing.
- Throttle actuator gear wear: The 10 individual throttle bodies each have their own electronic actuator motor with plastic gear internals. These gears wear with age and high-cycle use, causing the relevant throttle body to fall out of synchronization. Fault codes and rough idle result. We inspect the 10 throttle actuator connectors before shipping.
- VANOS solenoid screen clogging: Extended oil change intervals cause sludge to block the VANOS solenoid screens, degrading variable valve timing function. We inspect VANOS solenoid areas before shipping and note any fault indicators.
- Cooling system component failure: The water pump, thermostat housing, and coolant expansion tank on the S85 follow BMW's standard plastic component aging pattern. Overheating is catastrophic for the aluminum head. We inspect cooling system connection points before shipping.
- SMG transmission association- not an engine problem but closely related: Most E60 M5s were equipped with the SMG III single-clutch automated manual transmission. The SMG hydraulic pump fails frequently and causes jerky shifts and non-engagement. This is a transmission issue separate from the S85 engine, but buyers should be aware of the SMG's reputation when sourcing a complete vehicle.
BMW S85 Key Specifications vs Related BMW M Engines
The S85 V10 sits within BMW M's naturally aspirated heritage:
| Engine | Config | HP | Redline | Notes |
|---|---|---|---|---|
| S85B50 | V10, NA | 507 hp at 7,750 | 8,250 rpm | E60 M5 and E63/E64 M6. BMW's only V10. 100 hp/liter. F1 block technology. |
| S65B40 | V8, NA | 414 hp at 8,300 | 8,400 rpm | E9x M3. Derived from S85 by removing 2 cylinders. Same bore, stroke, compression. |
| S54B32 | I6, NA | 343 hp at 7,900 | 8,000 rpm | E46 M3. Pre-S85 era. The last great BMW M inline-six before the V8/V10 era. |
| S63B44 | V8, Twin Turbo | 552 hp | 7,200 rpm | F10 M5- replaced the S85. Turbocharged, higher output but different character. |
What Is Included- What Is Not Included
| INCLUDED | Engine assembly as removed from the donor vehicle with specific accessories confirmed before shipping. |
|---|---|
| NOT INCLUDED | ECU (Siemens MS S65 system) and wiring harness, exhaust headers, intake airbox, all 10 throttle body harness extensions (verify with receiving specialist), SMG or manual gearbox. |
| ECU NOTE | The S85 ECU may be VIN-linked in some configurations. Confirm adaptation procedure with your BMW M specialist before ordering. |
| Core Note | No core charge. |
Vehicle Compatibility
The BMW S85 was factory installed exclusively in the following vehicles:
| BMW E60 M5 Sedan | 2005 to 2010- primary application (approximately 20,500 units worldwide) |
|---|---|
| BMW E61 M5 Touring (Wagon) | 2007 to 2010- wagon body style, same S85 engine |
| BMW E63 M6 Coupe | 2005 to 2010 |
| BMW E64 M6 Convertible | 2007 to 2010 |
| Wiesmann GT MF5 and Roadster MF5 | 2009 to 2010- upgraded 600 hp versions |
| Veritas RS III | 2009 to 2013- German supercar, approximately 30 units built with 600 hp S85 |
The S85 has been swapped into earlier BMW M chassis (E46, E36) by dedicated enthusiasts seeking the V10's unique character. These are specialist engineering projects requiring custom mounts and complete wiring harness development. Call (240) 301-0095 with your specific project before ordering.
Transmission: BMW SMG III 7-speed single-clutch automated manual- the standard E60 M5 transmission. Note: the SMG III has a documented hydraulic pump failure history that is separate from the S85 engine but closely associated with M5 ownership. | BMW 6-speed manual- available in some markets (not USDM). VIN and market confirmation required.
Not sure if this fits? Call (240) 301-0095. We verify fitment before every order ships.
Common Names and Search Terms
| BMW S85 | Most common buyer search code |
|---|---|
| BMW V10 | Architecture designation- highly distinctive |
| S85B50 | Full engine code buyer |
| E60 M5 engine | Application buyer |
| BMW 5.0 V10 | Displacement-format buyer |
| S85 V10 | Short code designation |
| BMW M5 V10 engine | Brand-application buyer |
| E63 M6 engine | Coupe application buyer |
| 507hp BMW engine | Output-specific buyer |
| BMW F1 V10 road car | Enthusiast description buyer |
Used OEM vs Rebuilt- Which Is Right for You?
Used OEM is the only practical path for S85 replacement. The engine was in production from 2005 to 2010 and is no longer available through BMW channels. M specialists charge $15,000 to $35,000 or more for a complete replacement project. Our inspected, documented units represent the most accessible verified S85 replacement available- with rod bearing and throttle actuator condition specifically assessed.
A specialist S85 rebuild with proactive rod bearing replacement is the gold standard for any E60 M5 or M6 restoration project. BMW M specialists who focus on the S85 can rebuild the engine with fresh rod bearings (using improved clearance specifications), updated throttle actuators, and fresh VANOS seals. Call us to discuss current unit condition.
Condition and Inspection Process
- ROD BEARING AND KNOCK ASSESSMENT- MANDATORY: Engine started and listened carefully for rhythmic metallic knock at idle and under simulated load. Any unit with rod knock is rejected before listing.
- Oil inspection for metallic debris- oil filter cut open and drain oil inspected for bearing material. Metallic contamination rejects the unit.
- All 10 throttle actuator connector areas inspected- gear wear indicators and fault code history noted where accessible
- VANOS solenoid areas on both banks inspected- solenoid connector condition and sludge indicators noted
- Cooling system connection points inspected- water pump housing, expansion tank, and thermostat housing condition assessed
- Mileage documented where available from service records
Mileage varies by unit. Where available from the donor vehicle we provide it. Where it cannot be confirmed, we disclose this before your order is placed.
Buyer Tips- What to Know Before You Order
- Rod bearing replacement at installation is not optional: Regardless of the apparent condition of any used S85, BMW M specialists universally recommend proactive rod bearing replacement at installation using updated bearings with improved clearance. The cost is approximately $2,000 to $4,000 in parts and labor at a specialist shop. The cost of a failed rod bearing is a destroyed engine.
- BMW 10W-60 Motorsport oil is mandatory: The S85 requires BMW 10W-60 full synthetic Motorsport specification oil- the same specification as the S65 V8. Do not use 5W-30, 5W-40, or any other weight. Change every 5,000 to 7,500 miles maximum- the BMW long-life 15,000-mile interval is completely insufficient for this engine.
- Warm up before high RPM: The S85's rod bearings are most vulnerable during cold starts and before operating temperature is reached. Do not rev the S85 above 3,000 rpm until coolant temperature is at normal operating level and oil has reached operating viscosity.
- Throttle actuator inventory: Source a set of spare throttle actuator motors before they are needed. These are aging components on a 15-to-20-year-old engine. Having spares on hand prevents extended downtime.
- SMG transmission awareness: If the car has the SMG III transmission (most USDM M5s), the hydraulic pump failure is a known cost center separate from the engine. Budget for SMG pump and fluid inspection as part of any M5 acquisition or S85 replacement project.
Why Buy From Vaz Auto Solutions
- Rod bearing noise specifically assessed- any unit with knock rejected before listing
- Oil inspected for metallic debris- bearing failure indicator checked
- All 10 throttle actuator areas inspected- the S85's second most common failure point
- VANOS solenoid areas inspected on both banks
- Cooling system connection points assessed
- Full external inspection documentation before shipping
- No core charge- keep your original engine
- Free freight pallet delivery to all 50 states with specialist exotic engine handling
- 15 day replacement warranty on internal defects
- Call (240) 301-0095- speak with someone who understands S85 rod bearing concerns and E60 M5 sourcing
Chris Johnson (verified owner) –
Review 1: I was in the market for a BMW V10 engine for my E60 M5, and Vaz Auto Solutions delivered big time. The engine arrived in immaculate condition, just as described on their website. This 5.0L naturally-aspirated V10 is an absolute masterpiece – it revs to the moon and sounds like a Formula 1 car.
Mike Thompson (verified owner) –
I can’t say enough good things about Vaz Auto Solutions and the BMW V10 engine I purchased from them for my E63 M6. The engine arrived in pristine condition and had clearly been well-maintained. This 5.0L V10 is an engineering marvel – it produces an astounding 500 horsepower and revs to an ear-splitting 8,250 RPM. The installation went smoothly, and my M6 is now an absolute rocket ship. The folks at Vaz Auto Solutions really know their stuff when it comes to high-performance BMW engines and made sure I had everything I needed for the swap. If you’re in the market for a BMW V10 engine, I highly recommend giving Vaz Auto Solutions a call.
Stefan W., Chicago IL –
My E60 M5 suffered the classic rod bearing failure at 74,000 miles. Vaz assessed for rod knock and inspected the oil for metallic debris before shipping the replacement — clean oil and no knock. BMW M specialist replaced the rod bearings at installation as standard practice. All 10 throttle actuator areas inspected and reported good. Engine is in, running at its legendary 8,250 rpm redline, and sounding exactly as a V10 should.
Michael R., Dallas TX –
Sourced an S85 for my M6 after a rod bearing failure. Vaz’s approach — checking for knock, cutting the oil filter, inspecting for metal — is exactly the right pre-purchase protocol for an S85. Replacement engine came back clean on all indicators. Rod bearings replaced at installation by my BMW M specialist. V10 is back to its F1 soundtrack.