The Most Common BMW N62 540i, 545i, 550i, 650i, 740i, and 750i Engine Problems BMW N62 Common Problems & Reliability Issues. Granted, the N63 is quite different from the N62 in that it has turbos inside the V and is a reverse-flow engine. The BMW trade off used to be better driving dynamics in exchange for more maintenance. The BMW N62 are popular engines and with carefully picked tuning mods like remapping, turbo improvements and camshafts you will greatly improve your driving experience. The common problems with the N62 engine are: The Alternator oil seal The leaking Coolant resovoir The small coolant recovery hose on top of the rad The peep hole leak by the water pump on the engine block The diaphrams on the valve covers The dreded valve stem seals The valvetronic motor malfunction the bad oil pump caused by bad LOF service Common issues with the N62 engine. It was developed on the basis of the elder engine N62B44.In its cylinder block a crankshaft with stroke 81.3 mm was installed. This is already numerous engine, equipped with Valvetronic, whose performance (normal idle and evened mechanical efficiency of cylinders) is restored, simply replacing HVA. It was created on the basis of the N62B48.In its cylinder block a crankshaft was installed with the piston stroke shortened to 84.1 mm, and the diameter of cylinders reduced from 93 mm to 87 mm. The engine BMW N62B40 belongs to the series N62TU. The common problems with the N62 engine are: The Alternator oil seal The leaking Coolant resovoir The small coolant recovery hose on top of the rad The peep hole leak by the water pump on the engine block The diaphrams on the valve covers The dreded valve stem seals The valvetronic motor malfunction the bad oil pump caused by bad LOF service On BMW N62, N63 and other engines especially e65, e66, e60, e63, e64 series most likely you might experience some gas pedal lag delay or uneven power delivery at lows. It has replaced the N62B36 motor. BMW 4.4-liter N63 Engine Experiencing Frequent Reliability Problems. If you have the BMW N62 engine in your car - 645i, 650i, 745i or 750i and you are getting problems with blue smoke from the exhaust you have probably … BMW N62B36 engine reliability, problems and repair. BMW N62B48 engine reliability, problems and repair. The N63 is even worse than the N62 in a lot of respects, to the point of where BMW is fixing them for free by calling it a "customer care package" as opposed to a recall. (Mods, consider making this a sticky) E63 / E64 6 Series (2004 - 2010) The next generation of N62B44 V8 was launched in 2001, having replaced M62B44.Comparing to the previous model, the BMW N62 engines had series of innovations, such as Valvetronic and Dual-VANOS. IMO the only two ways to own an out of warranty BMW are to DIY things yourself, or be so wealthy these recurrent problems don't bother you. I don't know how this can be a surprise however -- these issues have been extensively covered over the past few years. BMW’s N62 V8 engine was produced from 2001-2010 and is available in four sizes including 3.6L, 4.0L, 4.4L, and 4.8L variants. Subjectively, the engine now runs evenly, without permanent vibration, all problems in idle have disappeared. BMW N62B44 engine reliability, problems and repair. BMW N62B40 engine reliability, problems and repair. Most of these problems could have happened to any model, just less than "German" workmanship.