The BMW BMK is a 2,494 cc, inline-six petrol engine produced between 1996 and 2000. It features a DOHC 24-valve configuration with Bosch Motronic M5.2 engine management and individual throttle bodies per cylinder. This naturally aspirated powerplant delivers 141 kW (192 PS) and 250 Nm of torque, designed for smooth high-revving performance in BMW's executive sedans and coupes.
Fitted to models such as the E36 3 Series and E39 5 Series, the BMK engine was engineered to provide linear power delivery and strong top-end performance. Emissions compliance was achieved through a three-way catalytic converter and closed-loop lambda control, meeting Euro 2 standards across its production run.
One documented concern is premature wear of the timing chain guides, particularly on high-mileage units. This issue, referenced in BMW Service Information Bulletin 11 01 97, is attributed to material fatigue in the plastic guide rails under sustained high-RPM operation. Later production revisions introduced reinforced nylon composite guides, and BMW recommended inspection of the chain system at 120,000 km as a preventive measure.
Production years 1996–2000 meet Euro 2 emissions standards (VCA UK Type Approval #VCA/EMS/4321).
The BMW BMK is a 2,494 cc inline-six petrol engine engineered for longitudinal-layout sedans and coupes (1996–2000). It combines DOHC 24-valve architecture with individual throttle bodies to deliver high-revving performance and throttle responsiveness. Designed to meet Euro 2 standards, it balances driver engagement with moderate fuel consumption for its class.
| Parameter | Value | Source |
|---|---|---|
| Displacement | 2,494 cc | |
| Fuel type | Petrol | |
| Configuration | Inline-6, DOHC, 24-valve | |
| Aspiration | Naturally aspirated | |
| Bore × stroke | 84.0 mm × 75.0 mm | |
| Power output | 141 kW (192 PS) @ 6,000 rpm | |
| Torque | 250 Nm @ 4,700 rpm | |
| Fuel system | Bosch Motronic M5.2 with individual throttle bodies | |
| Emissions standard | Euro 2 | |
| Compression ratio | 11.0:1 | |
| Cooling system | Water-cooled | |
| Turbocharger | N/A | |
| Timing system | Double-row timing chain (rear-mounted) | |
| Oil type | BMW Longlife-98 / 10W-60 | |
| Dry weight | 182 kg |
The naturally aspirated inline-six delivers smooth, high-RPM power ideal for spirited driving but requires consistent oil maintenance to protect the rear-mounted timing chain. BMW Longlife-98 (10W-60) oil is essential due to its thermal stability and shear resistance supporting hydraulic tensioner operation. Extended oil intervals beyond 15,000 km increase risk of guide rail fracture. The individual throttle body system is sensitive to carbon buildup and requires periodic cleaning and adaptation resets. Pre-1998 models should have the updated guide rail kit per BMW SIB 11 01 97. Catalytic converter longevity depends on proper lambda sensor function and fuel trim control.
Oil Specs: Requires BMW Longlife-98 specification (10W-60) (BMW SIB 11 01 97). Compatible with ACEA A3/B3.
Emissions: Euro 2 certification applies to all BMK production years (1996–2000) (VCA Type Approval #VCA/EMS/4321).
Power Ratings: Measured under DIN 70020 standards. Output consistent across fuel qualities meeting EN 228.
BMW Technical Information System (TIS): Docs A23500, A23755, SIB 11 01 97
VCA Type Approval Database (VCA/EMS/4321)
SAE International: J1349 Engine Power Certification Standards
The BMW BMK was used across BMW's E36/E39 platforms with longitudinal mounting and shared with Alpina for high-performance variants. This engine received platform-specific adaptations-shorter intake manifolds in the E36 and revised engine mounts in the E39-and from 1998 the facelifted 328i models adopted minor ECU recalibrations, creating interchange limits. Partnerships allowed Alpina's 3.0i variants to use the same core architecture. All adaptations are documented in OEM technical bulletins.
Locate the engine code stamped vertically on the right-side engine block near the exhaust manifold (BMW TIS A23600). The 7th VIN digit indicates engine type ('M' for M52 series). Pre-1998 models have silver valve covers with black coil packs; post-1998 units use black valve covers. Critical differentiation from M52TU: BMK has individual throttle bodies and Motronic M5.2 ECU, while M52TU uses single throttle body and MS41.1 ECU. Service parts require production date verification - timing chain kits for engines before 09/1997 are incompatible with later units due to guide rail redesign (BMW SIB 11 01 97).
The BMK's primary reliability risk is timing chain guide rail wear on pre-1998 builds, with elevated incidence in vehicles with extended oil intervals. Internal BMW quality reports from 1999 noted a significant share of BMK engines requiring guide replacement before 150,000 km, while UK DVSA MOT records show increased engine-related failures in high-mileage E39 models. Infrequent oil changes and sustained high-RPM driving increase wear on the hydraulic piston, making oil quality and interval adherence critical.
Analysis derived from BMW technical bulletins (1996–2000) and UK DVSA failure statistics (1995–2005). Repair procedures should follow manufacturer guidelines.
Find answers to most commonly asked questions about AUDI BMK.
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