BMW 540i
4.0 litres and 306 hp — the most compact variant of the N62 family. Constructionally identical to the larger brothers: aluminium block, magnesium bedplate, Valvetronic, double VANOS. Sonically slightly more restrained than the 4.8, but still unmistakably V8. All known weaknesses — valve stem seals, coolant transfer pipe, Valvetronic wear — apply equally. Oil changes every 10,000–12,000 km instead of BMW Longlife significantly extends the life of all mechanical components.
Four-Litre V8 Sweet Spot
The N62B40 in the E60 is the most sensible V8 choice: 306 hp, same tech as the bigger siblings, but with less thermal stress. Enough power for anything, identical service items. Love the E60 and want a V8? Start here — it sounds better than any straight-six.
Engine Weaknesses 9
Rubber seals harden from ~130,000 km; oil passes the valve stems into the combustion chamber. Classic finding: blue smoke on cold start after standing. Special tool allows replacement without removing the camshafts.
Symptoms: Blue-white smoke from the exhaust on cold start and after idle periods. Increased oil consumption (0.5–1 L/1,000 km). No smoke when warm under load.
Aluminium pipe between the cylinder heads in the V seals with O-rings. These harden over time and coolant disappears without visible external leakage. Repair requires removal of the intake manifold.
Symptoms: Gradual coolant level drop without visible leakage. Sweet smell in the engine bay. Coolant warning light. In advanced stages risk of overheating.
The original plastic impeller can break at high mileage and spin freely — engine overheats without warning. Preventive replacement at 150,000 km with a metal impeller is recommended.
Symptoms: Engine temperature rises sharply and suddenly. Slight ticking at idle that disappears when driving. Coolant warning light. In extreme cases overheating damage.
Intermediate levers wear into the eccentric shaft bearing surfaces, mostly due to condensate in the oil from short-trip driving. Valvetronic enters limp mode; misfires on individual cylinders.
Symptoms: Misfires on cold start. Engine light. Power loss. Valvetronic limp mode with restricted drivability. Misfires are cylinder-specific.
The N62 has two electrically controlled thermostats. Failures cause the engine to run permanently cold or to overheat. Rarely a sudden failure — usually gradual.
Symptoms: Engine does not reach operating temperature or runs too hot. Heating works poorly. Increased fuel consumption. Coolant temperature fault code.
With long oil change intervals or short-trip driving, sludge builds up in the VANOS solenoid valves — camshaft adjustment responds sluggishly or not at all.
Symptoms: Rough cold start. Lack of power in the lower rev range. Engine light with camshaft fault code. Ticking noise on startup.
Rubber seal on the alternator bracket ages and leaks. Oil collects on the driver's side. Removal requires engine lifting — high labour cost for an inexpensive part.
Symptoms: Oil seeping from driver's side of engine bay. Oil spots under the car. Occasional oil smell. Oil can drip onto hot engine parts and smoke.
CCV membrane tears at high mileage; excessive crankcase vacuum pushes oil into the intake tract. Increased oil consumption also under load.
Symptoms: Strong vacuum when opening the oil filler cap. Oil in the intake tract. Increased oil consumption. Blue smoke even under load.
Check valve of the secondary air pump gives way, exhaust flows back and damages the pump. Engine light during cold start phase, no drivability fault.
Symptoms: Engine light after cold start. Noise from engine bay on cold start. No noticeable power loss. Fault often clears itself after warm-up.
Vehicle Weaknesses 6
The optional active steering can rotate the steering wheel up to 90 degrees or lock the steering due to AFS control unit faults. Recalibration or control unit replacement (over 1,000 €) required.
Rust bubbles form in the seam between the rear window and boot lid. Occurs even on well-maintained garaged vehicles because moisture gets trapped in the hemmed edge.
The iDrive infotainment system overheats due to a failed cooling fan — system no longer starts or runs with limited function. Fan runs continuously and drains the starter battery.
Aluminium front control arms on the E60/E61 are particularly prone to wear. Regular inspection is necessary as wear affects handling and tyre wear.
Valve cover gasket and oil filter housing gasket become porous on older E60s. Oil smell in engine bay and visible oil traces. On the M57N2 diesel, crankcase ventilation often also causes oil burning.
Rubber bushings in the rear integral arms wear from around 120,000 km and produce creaking noises. Worn shock absorbers and axle bearings are typical age-related issues.