The BMW M60 B40 (408S1) is a 3,982 cc, naturally aspirated V8 petrol engine produced between 1992 and 1995. It marked BMW's return to V8 powerplants after a 25 — year hiatus, featuring dual overhead camshafts (DOHC), four valves per cylinder, and individual throttle bodies. With a peak output of 210 kW (286 PS) and 400 Nm of torque, it delivers smooth, linear power delivery ideal for luxury grand tourers.
Fitted to the E32 7 Series (740i) and E31 8 Series (840Ci), the M60 B40 was e…
Production years 1992–1994 meet Euro 2 standards; 1995 models comply with Euro 3 .
The BMW M60 B40 (408S1) is a 3,982 cc V8 naturally aspirated engine engineered for flagship and grand tourer applications (1992–1995). It combines DOHC valvetrain architecture with individual throttle bodies and hydraulic lifters to deliver linear power delivery and high-RPM smoothness. Designed to meet Euro 2 and later Euro 3 standards, it balances performance with refinement.
| Parameter | Value | Source |
|---|---|---|
Displacement | 3,982 cc | |
Fuel type | Petrol | |
Configuration | V8, DOHC, 32-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 84.0 mm × 88.3 mm | |
Power output | 210 kW (286 PS) @ 5,800 rpm | |
Torque | 400 Nm @ 4,500 rpm | |
Fuel system | Bosch Motronic 1.3, sequential port injection | |
Emissions standard | Euro 2 (1992–1994); Euro 3 (1995) | |
Compression ratio | 10.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Double-row roller chain (non-interference design) | |
Oil type | Refer to vehicle handbook / manufacturer specification | |
Dry weight | 202 kg |
The BMW M60 B40 (408S1) was used across BMW's E32 and E31 platforms with longitudinal mounting. This engine received platform-specific adaptations-integrated air intake routing in the E32 limousine and compact exhaust manifold in the E31 coupe-and from 1995 the updated E32 LCI models adopted revised ECU calibration and ignition coils, creating interchange limits. All adaptations are documented in OEM technical bulletins.
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Field reports and technical service bulletins highlight component wear patterns under high-load operation. Adherence to manufacturer service intervals and approved fluid specifications is critical for long-term reliability.
Analysis derived from manufacturer technical service bulletins and industry workshop records. Repair procedures should follow manufacturer guidelines.
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The M60 B40 is generally robust when properly maintained, but early models (1992–1993) are prone to camshaft wear if incorrect oil or extended service intervals are used. Later units (1994–1995) with updated metallurgy and BMW 502.00 oil are more durable. Regular oil changes, coolant service, and flywheel inspection significantly enhance longevity.
Primary issues include camshaft lobe wear (especially pre-1994), coolant leaks from hoses or thermostat housing, intake manifold runner flap failures, and dual-mass flywheel wear. These are documented in BMW service bulletins and supported by long-term owner reliability data.
The M60 B40 was used in the E32 7 Series (740i, 1992–1995) and the E31 8 Series (840Ci, 1992–1995). It replaced the M30B35 and was succeeded by the M62B44 in 1996 with updated electronics and emissions control.
Yes, though naturally aspirated, the M60 B40 responds well to modifications. Common upgrades include performance camshafts, ported heads, and aftermarket intake/exhaust systems. ECU remapping is limited due to Motronic 1.3 constraints, but standalone systems enable greater tuning potential. Stock internals support moderate increases up to 320 PS with supporting mods.
In combined driving, the M60 B40 achieves approximately 13.5–15.0 L/100km (21–19 mpg UK). Highway cruising can reach 11.0 L/100km (~26 mpg UK), while city driving may exceed 18.0 L/100km (~16 mpg UK). Real-world economy depends on driving style and vehicle weight.
No. The M60 B40 uses a non-interference timing chain design. If the chain skips or breaks, piston-to-valve contact is unlikely, reducing risk of catastrophic engine damage. However, immediate repair is still advised to prevent secondary issues.
BMW specifies SAE 10W-40 oil meeting BMW 502.00 standard. This formulation provides necessary protection for the camshafts and hydraulic lifters. Oil changes should occur every 12,000–15,000 km or annually to prevent wear, especially in early production engines.
Comprehensive technical documentation and regulatory references
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GOV.UK: Vehicle Approval & V5C
UK vehicle approval processes, import rules, and MoT guidance.
DVLA: Engine Changes & MoT
Official guidance on engine swaps and inspection implications.
Vehicle Certification Agency (VCA)
UK type-approval authority for automotive products.
Regulation (EC) No 715/2007
Euro emissions framework for vehicle type approval.
Commission Regulation (EU) 2017/1151
WLTP and RDE testing procedures for emissions certification.
GOV.UK: Vehicle Approval
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VCA Certification Portal
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