BMW M GmbH S85B50 — 5L V10, 90-degree bank angle, 40V (4 valves per cylinder), DOHC (double overhead camshafts per bank), Double-VANOS (continuously variable intake and exhaust cam timing on both banks), 10 individual electronic throttle bodies (one per cylinder, two VDO actuator units driving 5 throttles each per bank), aluminum-silicon (Alusil) block, bedplate bottom end, dual oil pumps (pressure + scavenge), 12.0:1 compression ratio, 8250 RPM redline, Siemens MS S65 engine management, motorsport-derived F1-influenced architecture Engine
5L V10, 90-degree bank angle, 40V (4 valves per cylinder), DOHC (double overhead camshafts per bank), Double-VANOS (continuously variable intake and exhaust cam timing on both banks), 10 individual electronic throttle bodies (one per cylinder, two VDO actuator units driving 5 throttles each per bank), aluminum-silicon (Alusil) block, bedplate bottom end, dual oil pumps (pressure + scavenge), 12.0:1 compression ratio, 8250 RPM redline, Siemens MS S65 engine management, motorsport-derived F1-influenced architecture · 500-507 hp (373-380 kW) @ 7750 RPM hp · 520 Nm (383 lb-ft) @ 6100 RPM Nm
Engine overview
Manufacturer
BMW M GmbH
Displacement
5 L
Configuration
V10, 90-degree bank angle, 40V (4 valves per cylinder), DOHC (double overhead camshafts per bank), Double-VANOS (continuously variable intake and exhaust cam timing on both banks), 10 individual electronic throttle bodies (one per cylinder, two VDO actuator units driving 5 throttles each per bank), aluminum-silicon (Alusil) block, bedplate bottom end, dual oil pumps (pressure + scavenge), 12.0:1 compression ratio, 8250 RPM redline, Siemens MS S65 engine management, motorsport-derived F1-influenced architecture
Power
500-507 hp (373-380 kW) @ 7750 RPM hp
Torque
520 Nm (383 lb-ft) @ 6100 RPM Nm
Production years
2005-2010
Fuel type
Petrol
Vehicles with this engine
Common torque specifications
| Connecting Rod Bearing Cap Bolts M9x1 | TORQUE-TO-YIELD — single use only. BMW 3-cycle seating procedure: Stage 1: 6 Nm (jointing). Stage 2: 20 Nm (setting). Stage 3: +130 degrees angle. The full 3-stage sequence is performed, released, and repeated three times to seat bearing shells; the final tightening is the binding torque. Use a calibrated angle-torque wrench. Never reuse rod bolts. unconfirmed |
|---|---|
| Main Bearing Bedplate Bolts | Torque-to-yield, new bolts mandatory. Primary bolts: approx. 20 Nm + 90–100 degrees angle (staged, graded sequence from center outward per BMW TIS — verify exact angle by bolt class). Cross/side bolts torqued to separate spec per TIS. unconfirmed |
| Cylinder Head Bolts | Torque-to-yield, new bolts mandatory. Pre-torque: ~30 Nm. Angle stages: typically two stepped angle stages totaling ~180–200 degrees (verify per TIS sequence for S85 — must be performed from center outward). Do not reuse. unconfirmed |
| Oil Pump Drive Sprocket Nut | 25 Nm (serrated-toothing interface) OR 55 Nm (dihedron/flats interface) — confirm which interface is fitted. Apply Loctite 243. Safety-wire after torquing. Use new nut only. unconfirmed |
| Oil Drain Plug | 25 Nm (aluminum sump — always use new sealing washer; do not overtorque) unconfirmed |
| Spark Plugs | 23–25 Nm (into aluminum heads — use thread lubricant on first install; do not overtorque) unconfirmed |
| Vanos Solenoid Bolts | 10 Nm (small fasteners — do not exceed) unconfirmed |
| Camshaft Bearing Cap Bolts | 12–14 Nm in staged sequence (hand-tighten all, then torque in stages from center outward) unconfirmed |
| Throttle Body Mounting Bolts | 8–10 Nm unconfirmed |
| Flywheel To Crankshaft Bolts | New bolts: ~30 Nm + 50–60 degrees angle per TIS unconfirmed |
| Oil Filter Housing Bolt | 25 Nm unconfirmed |
| Wheel Bolts | 120 Nm (M12x1.5 lug bolts — reference) unconfirmed |
Figures marked unconfirmed could not be cross-checked against a workshop source. Verify against the vehicle’s own documentation before tightening.
Service intervals
| Oil And Filter Km | Factory CBS: up to 24,000 km / 2 years. STRONGLY recommended for S85: 8,000–12,000 km / 5,000–7,500 mi or annually — the single most impactful rod-bearing preventive action. |
|---|---|
| Oil Capacity L | Approx. 9.0 L with filter (always verify on dipstick / electronic oil level — never rely on volume alone) |
| Oil Spec | SAE 10W-60, BMW M-approved (e.g. Castrol TWS Motorsport 10W-60 or BMW Genuine M TwinPower 10W-60). Do NOT substitute a thinner grade. |
| Spark Plugs Km | 50,000–60,000 km — 10 plugs total (NGK ILZKBR8G8S or OEM equivalent); inspect at 40,000 km on hard-driven cars |
| Coolant Km | Every 60,000 km or 4 years (BMW blue / G48-compatible antifreeze, 50:50 with distilled water) |
| Brake Fluid Years | Every 2 years regardless of mileage (BMW DOT 4 / SAE J1703) |
| Air Filter Km | 50,000–60,000 km (two elements, one per bank); inspect annually in dusty environments |
| Vanos Solenoid Service Km | Inspect and clean VANOS solenoids at 80,000–100,000 km; replace if clogged |
| Throttle Actuator Inspection Km | Inspect actuator function and gear condition at 80,000–100,000 km; plan replacement by 120,000 km |
| Rod Bearing Proactive Km | Proactive replacement by 100,000 km / 60,000 mi with new rod bolts — treat as a scheduled maintenance item, not a reactive repair |
| Smg Hydraulic Fluid Km | Inspect / replace SMG-III hydraulic fluid and filter every 40,000–60,000 km |
| Manual Gearbox Oil Km | 80,000–100,000 km (if manual conversion fitted; use BMW MTF-LT-5 or equivalent) |
| Differential Oil Km | 80,000–100,000 km (BMW rear diff — use M-spec limited-slip-compatible gear oil) |
| Oil Pump Nut Check Km | Inspect and re-torque at every sump-off service; proactively at 80,000–100,000 km if not previously checked |
Special tools
- BMW 11 9 340 + 11 9 341 — Crankshaft TDC locking pin and vibration damper counter-hold fixture — required for all timing and f
- BMW 11 6 480 / 11 9 280 series (S85 cam locking plates) — Camshaft alignment and locking fixtures for both banks — required when servicing Double-VANOS or tim
- BMW 11 4 480 series (rod bearing service aids) + plastigauge set — Connecting rod bearing clearance measurement tools; use plastigauge on each journal to verify cleara
- Angle torque gauge / torque-angle adapter (e.g. Norbar, Snap-on, or digital equivalent) — Mandatory for all torque-to-yield fasteners — rod bolts (130°), head bolts, main bolts. Cannot be do
- BMW ISTA / ISTA-D diagnostic interface (ICOM or ENET cable + laptop) — Required for EDK (throttle) adaptation after actuator replacement, SMG clutch wear readout, VANOS fa
- In-situ valve spring compressor (air-tool type, e.g. OTC 6488 or similar for deep-well BMW application) — Compress valve springs with heads in place for valve stem seal replacement; requires shop-air line i
- BMW 11 5 040 series — deep-recessed spark plug socket and extension — Access all 10 spark plugs in S85 deep valve cover wells without cross-threading in aluminum head
- Safety-wire kit + drilled-nut oil pump securing hardware (specialist supplier) — Lock the oil pump drive sprocket nut against loosening after correct torque and thread locker applic
- Engine crane + engine stand + BMW E60/E63 subframe drop equipment — Rod bearing replacement, valve stem seal replacement, and timing chain work all require engine remov
Pro tips from the field
Rod bearings define the S85's service life. Treat it as a planned-maintenance item: frequent oil changes on the correct 10W-60 spec, periodic used-oil analysis to watch for rising wear-metal trends, and proactive rod bearing replacement with new, single-use rod bolts at higher mileage. Never reuse rod bolts, and follow BMW's torque-plus-angle procedure exactly.
When the engine is out for rod bearings, it's worth bundling other wear-item work at the same time — inspecting/replacing main bearing shells if worn, refreshing VANOS seals, replacing valve stem seals, checking the oil pump drive, fitting new spark plugs, and refreshing coolant — since a separate future visit doubles labor cost.
The oil pump nut is free insurance. Check, re-torque, Loctite, and safety-wire the oil pump drive sprocket nut any time the sump is off. It costs nothing if caught; it costs the engine if missed.
Warm it before you wind it. The biggest owner-controllable bearing-life factor is not revving past 4,000 RPM until oil temperature reaches 80°C. Cold high-RPM excursions thin the oil film exactly when the journals are at worst clearance. The instrument cluster oil-temp gauge (visible via iDrive) is your cue — not coolant temperature.
10W-60 is non-negotiable. The S85 was engineered around this viscosity for its journal sizes and bearing clearances. Do not 'modernize' to 5W-40 or 5W-50 — thinner oils reduce film thickness at the high RPM and load this engine generates. Shell, Castrol TWS, Mobil 1 FS 10W-60, and BMW Genuine M are all acceptable.
SMG-III is half the car. The vast majority of E60 M5 and E63/E64 M6 cars carry the SMG-III. Before purchase: read clutch wear via ISTA (aim for >60% remaining), verify pump/accumulator pressure cycles correctly, scan for SMG fault history. A manual conversion (factory 6-speed parts) eliminates the risk entirely for enthusiast buyers.
VANOS solenoids need clean oil. Sludged solenoids are almost always caused by extended oil intervals. A car with proven short oil-change history will have significantly healthier VANOS operation. On any newly acquired car, pull and ultrasonically clean the VANOS solenoids as a first step — it is a cheap diagnostic and often restores cold-start behavior.
Fitting a new throttle actuator requires a full electronic throttle adaptation via BMW-specific diagnostic software before the car will idle and drive correctly — there is no manual throttle synchronization on the S85. Budget diagnostic time for this on any actuator job.
Buy on documentation, not odometer. A 180,000 km S85 with proven short oil changes, a documented rod bearing job with new bolts, a fresh clutch, a healthy SMG pump, and refreshed cooling is a far safer buy than a 60,000 km car with BMW dealer full-interval service history. Demand oil-analysis records and rod bearing receipts.
Carbon and PCV are a secondary concern, not a primary one. Unlike direct-injection engines, the S85's port injection keeps intake valves relatively clean. Walnut blasting at high mileage is beneficial if valve stem seals are leaking, but do not over-prioritize it — rod bearings, SMG, and the oil pump nut kill these cars, not carbon.
The S85 rewards methodical owners and punishes negligent ones harshly. Maintained correctly, these engines are robust well past 200,000 km and will spin to 8,000 RPM with joy.
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TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
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The story behind TorqFix →Workshop data on this page last updated 22 Aug 2026.