The younger version of the M103 series developed and released as a replacement for the ancient M123 engine was the M103 E26. The basis for the creation of the 2.6-liter power unit was the M103 E30, the cylinder diameter of which was reduced to 82.9 mm (88.5 mm on the base engine). The cylinder head from the M103 E30 is adapted for the E26, the diameter of the intake valves has been reduced from 43 mm to 40 mm, and the diameter of the outlet valves from 39 mm to 35 mm. Fuel injection system – mechanical injection.
Specifications
| Manufacturer | Stuttgart-Bad Cannstatt Plant |
| Also called | M103 |
| Production years | 1985-1993 |
| Cylinder block alloy | cast iron |
| Fuel system | injector |
| Configuration | inline |
| Number of cylinders | 6 |
| Valves per cylinder | 2 |
| Piston stroke, mm | 80.2 |
| Cylinder bore, mm | 82.9 |
| Compression ratio | 9.2 |
| Displacement, cc | 2599 |
| Power output, hp | 160/5800 / 166/5800 |
| Torque output, Nm / rpm | 220/4600 / 228/4600 |
| Fuel type | 95 |
| Euro standards | — |
| Weight, kg | ~170 |
| Fuel consumption, L/100 km — city — highway — combined |
12.4 8.2 10.2 |
| Oil consumption, gr/1000 km | up to 1500 |
| Recommended engine oil | 0W-30 / 0W-40 / 5W-30 / 5W-40 / 5W-50 / 10W-40 / 10W-50 / 15W-40 / 15W-50 |
| Engine oil capacity, liter | 6.0 |
| Amount of engine oil for replacement, liter | ~5.5 |
| Oil change interval, km | 7000-10000 |
| Normal engine operating temperature, °C | ~90 |
| Engine lifespan, km — official information — real |
– 400+ |
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