The “father” of the BMW M30B35 engine (as well as the entire M30 line) is rightfully considered the former Ford developer Bernard Oswald, whom the cunning Bavarians lured away to help them create a series of inline sixes of the second generation. True, as far as this particular model is concerned, it, frankly, failed.
The fact is that it tried to use large-diameter cylinders, as a result of which the motor became too energy-loaded and much less reliable and durable than its “brothers” in the model range (the same M30B34, for example).
Specifications
| Manufacturer | Munich Plant |
| Also called | M30 |
| Production years | 1982-1992 |
| Cylinder block alloy | cast iron |
| Fuel system | injector |
| Configuration | inline |
| Number of cylinders | 6 |
| Valves per cylinder | 2 |
| Piston stroke, mm | 86 |
| Cylinder bore, mm | 92 |
| Compression ratio | 8.0 / 9.0 / 10.0 |
| Displacement, cc | 3430 |
| Power output, hp | 185/5400 / 211/5700 / 218/5500 |
| Torque output, Nm / rpm | 290/4000 / 305/4000 / 310/4000 |
| Fuel type | 92 |
| Weight, kg | ~145 |
| Fuel consumption, L/100 km — city — highway — combined |
17.3 8.0 9.8 |
| Oil consumption, gr/1000 km | up to 1000 |
| Recommended engine oil | 5W-30 / 5W-40 / 10W-40/ 15W-40 |
| Engine oil capacity, liter | 5.75 |
| Oil change interval, km | 7000-10000 |
| Normal engine operating temperature, °C | ~90 |
| Engine lifespan, km — official information — real |
— 400+ |
Frequent problems
Overheating is a common problem in BMW M30B35 engines. It is better not to allow such a situation, so as not to drive the cylinder head. A dirty radiator or pump, thermostat can provoke overheating. Quite often the cause is the plugs in the cooling mechanism.
Owners of cars with a BMW M30B35 engine may encounter cracks in the cylinder block that form around the threads of the cylinder head bolts. Damage occurs due to disassembly of the unit, as well as when oil is not removed from the threads. The presence of cracks is indicated by the rapid consumption of antifreeze when an emulsion appears in the oil. Sometimes they decide to resort to repairs, but it is advisable to buy and install the cylinder block without damage.
Due to long-term operation, motors have problems in regulating the valve of the gas distribution mechanism. In this case, the installation of new eccentrics, guide bushings and valves is required. Due to the impressive age of the engine, malfunctions of the mass air flow sensor may appear.
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