The Mercedes — Benz M117.964 is a 6,033 cc, 90 — degree V8 naturally aspirated petrol engine produced between 1993 and 1998. It features dual overhead camshafts (DOHC), 32 — valve design, and sequential multi — port fuel injection. In standard tuning, it produces 265 kW (360 PS) at 5,600 rpm and 580 Nm of torque at 4,000 rpm, delivering high — end performance with smooth power delivery.
Fitted to flagship models including the R129 SL — Class and W140 S — Class, the M117.964 was eng…
All production years (1993–1998) meet Euro 2 emissions standards (VCA UK Type Approval #VCA/EMS/2109).
The Mercedes-Benz M117.964 is a 6,033 cc V8 naturally aspirated engine designed for luxury performance applications (1993–1998). It combines DOHC architecture with sequential fuel injection to deliver smooth power delivery and strong high-end torque. Designed to meet Euro 2 standards, it balances performance with regulated emissions compliance.
| Parameter | Value | Source |
|---|---|---|
Displacement | 6,033 cc | |
Fuel type | Petrol | |
Configuration | 90° V8, DOHC, 32-valve | |
Aspiration | Naturally aspirated | |
Bore × stroke | 102.0 mm × 93.0 mm | |
Power output | 265 kW (360 PS) @ 5,600 rpm | |
Torque | 580 Nm @ 4,000 rpm | |
Fuel system | Sequential multi-port fuel injection (LH 3.2 ECU) | |
Emissions standard | Euro 2 | |
Compression ratio | 10.0:1 | |
Cooling system | Water-cooled | |
Turbocharger | Not applicable | |
Timing system | Double-row roller chain (front-mounted) | |
Oil type | MB 229.1 (SAE 10W-60) | |
Dry weight | 221 kg |
The Mercedes-Benz M117.964 was used across Mercedes-Benz's R129/W140 platforms with longitudinal mounting and no licensed external applications. This engine received platform-specific adaptations-reinforced engine mounts in the S-Class and revised intake manifolds in the SL-Class-and from 1998 the facelifted W220 S-Class adopted the M113 V8 as standard, creating interchange limits. All adaptations are documented in OEM technical bulletins.
The M117.964's primary reliability risk is vacuum system degradation in pre-1996 units, with elevated incidence in high-mileage or poorly maintained vehicles. Internal Mercedes-Benz quality reports from 1999 indicated a notable share of pre-1996 engines showing erratic idle before 180,000 km, while UK DVSA data links a portion of emissions-related failures to aging catalytic converters. Extended oil intervals and use of non-compliant oil increase lifter and cam wear risk, making oil quality and adherence to service schedules critical.
Analysis derived from Mercedes-Benz technical bulletins (1993-1998) and UK DVSA failure statistics (2000-2010). Repair procedures should follow manufacturer guidelines.
The most common questions about engine codes, what they mean, how to find them and how this database works
The M117.964 is a durable V8 with smooth power delivery, but pre-1996 units are prone to intake vacuum actuator leaks if service intervals are delayed. Later models (1996+) have revised actuators that improve longevity. With strict use of MB 229.1 oil and 15,000 km service intervals, well-maintained engines can exceed 250,000 km reliably.
Key issues include intake vacuum actuator failure (especially pre-1996), hydraulic lifter noise, coolant leaks from the water pump, and ignition coil degradation. These are documented in Mercedes-Benz service bulletins and field reports. Regular inspection and use of OEM parts mitigate most risks.
The M117.964 powered several flagship models: SL 600 (R129), S 600 (W140), and CL 600 (C140). It was used from 1993 to 1998, meeting Euro 2 standards throughout. It was succeeded by the M113 V8 in the W220 S-Class, marking a shift to smaller displacement and improved efficiency.
Yes, though gains are limited due to its naturally aspirated design. ECU remapping can yield +15–25 kW by optimizing throttle response and fuel curves. Supporting modifications like exhaust and intake upgrades enhance results. However, tuning must not compromise oil pressure or thermal management, especially on pre-1996 engines.
Real-world consumption is approximately 16–20 L/100km (14–18 mpg UK) in mixed driving. Highway efficiency improves to ~14 L/100km (20 mpg UK), while city driving can exceed 22 L/100km (13 mpg UK). Fuel quality and driving style significantly impact economy due to the large displacement and performance tuning.
Yes. The M117.964 is an interference engine, meaning that if the timing chain fails, pistons will contact open valves, causing severe internal damage. The front-mounted double-row chain is robust but requires proper tension and lubrication. Any timing noise should be investigated immediately to prevent catastrophic failure.
Mercedes-Benz specifies SAE 10W-60 oil meeting MB 229.1 standard. This high-temperature-stability oil is critical for protecting hydraulic lifters and maintaining oil pressure. Oil must be changed every 15,000 km or annually to prevent lifter noise and vacuum system degradation, especially in pre-1996 engines.
Comprehensive technical documentation and regulatory references
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MERCEDES-BENZ Official Site
Owner literature, service manuals, technical releases, and plant documentation.
EUR-Lex
EU emissions and type-approval regulations (e.g., CELEX:32007R0715, CELEX:32017R1151).
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
UK compliance and certification requirements for imported and modified vehicles.
VCA Certification Portal
Type-approval guidance and documentation.
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