M62B44

The M62TU variant uses VANOS variable valve timing which is prone to solenoid and seal failures over time. Swapping VANOS solenoids can cause power issues if not done correctly or if units are faulty. The earlier M62B44 lacks VANOS but the TU update introduced related complexity.

The E39 540i cooling system uses plastic components including the expansion tank, thermostat housing, and coolant hoses that become brittle with age. On a 20+ year old engine, complete cooling system refresh is considered mandatory preventive maintenance.

The M62 uses a single-row timing chain rather than a belt, which is generally durable but chain guides and tensioners can wear over high mileage, especially with infrequent oil changes. Failure to address worn guides can result in chain slap and eventual catastrophic failure.

Common on higher-mileage M62 engines, the valve cover gaskets and oil pan gasket deteriorate over time leading to visible oil seepage. While not immediately catastrophic, neglected leaks can cause oil starvation and contaminate other components.

Aging wiring harnesses and sensors including MAF, oxygen sensors, and crankshaft position sensors can cause intermittent faults on high-mileage examples. Poor electrical connections can also trigger crank-no-start conditions as noted in forum reports.

Forum data indicates fuel delivery issues can contribute to crank-no-start and rough running on older M62 engines. Fuel pump, fuel pressure regulator, and injector condition should be verified on any high-mileage example.