BMW automotive engine families listed as M51. Specifications below retain the source's separate family and variant labels.
Family specifications
BMW M51
| Field | Reported value |
|---|---|
| Manufacturer | BMW |
| Production | 1991-2000 |
| Configuration | Inline-6 |
| Displacement | 2.5 L; 152.4 cu in (2,497 cc) |
| Cylinder bore | 80 mm (3.15 in) |
| Piston stroke | 82.8 mm (3.26 in) |
| Cylinder block material | Cast iron |
| Valvetrain | SOHC 2 valves x cyl. |
| Compression ratio | 22.0:1 |
| Turbocharger | Single turbo, tds-engines also have an intercooler |
| Fuel system | Swirl-chamber-injection |
| Management | Bosch DDE 2.1 |
| Fuel type | Diesel fuel (DIN 51601) |
| Cooling system | Water-cooled |
| Power output | 85–105 kW (114–141 hp) |
| Torque output | 222–280 N⋅m (164–207 lb⋅ft) |
| Dry weight | 132 kg (291 lb) |
| Predecessor | BMW M21 |
| Successor | BMW M57 |
Variant specifications
Description
| Version | Power | Torque | Years |
|---|---|---|---|
| M51D25 UL | 85 kW (115 hp) at 4800 rpm | 222 N⋅m (164 lb⋅ft) at 1900 rpm | 1991–1997 |
| M51D25 OL | 105 kW (143 hp) at 4800 rpm | 260 N⋅m (192 lb⋅ft) at 2200 rpm | 1991–1996 |
| Opel X25DT | 96 kW (130 hp) at 4800 rpm | 250 N⋅m (184 lb⋅ft) at 1400 rpm | 1994–2001 |
| M51D25TÜ UL | 85 kW (115 hp) at 4800 rpm | 230 N⋅m (170 lb⋅ft) at 1900 rpm | 1996–1998 |
| M51D25TÜ OL | 105 kW (143 hp) at 4800 rpm | 280 N⋅m (207 lb⋅ft) at 2200 rpm | 1996–1998 |
| M51D25TÜ OL | 105 kW (143 hp) at 4600 rpm | 280 N⋅m (207 lb⋅ft) at 2200 rpm | 1998–2000 |
| M51D25M1 | 100 kW (136 hp) at 4400 rpm | 270 N⋅m (199 lb⋅ft) at 2300 rpm | 1995-2001 |
BMW automotive engine directory
Data adapted from the cited Wikipedia revision by Wikipedia contributors under CC BY-SA 4.0. Production dates and fitments reflect that revision; verify the exact engine code, market and vehicle before applying a specification.
Sources
Curated reference notes. Applicability follows the cited sources; hardware testing by this wiki is not implied.
- Wikipedia: List of BMW engines. Wikipedia contributors; CC BY-SA 4.0. Source revision oldid 1382309748; accessed 2026-11-10.
- Wikipedia: BMW M51. Wikipedia contributors; CC BY-SA 4.0. Source revision oldid 1380863475; accessed 2026-11-10.