Sparkplug options | BMW Forum - BimmerFest BMW Forums These NGK 94201 Laser Iridium replacement plugs are for B58 BMW engines They are suggested for higher boost E85, water meth injection, and or upgraded turbocharger applications
Oil Filter Housing Coolant Leak - BimmerFest BMW Forum The much heralded B58 has the same (but even worse due to plastic) oil filter housing gasket issue as the B55 Mine is leaking at 34K with the parts on order The B55 has aluminum oil filter housing BMW in their infinite wisdom engineered one bolt under the intake manifold requiring loosening it to remove the housing, Not fun but doable
B58 G05 X5 40i Cooling Circuits - BimmerFest BMW Forum Elsewhere on BF is a question of what are normal coolant temperatures For the B58 temperatures depend on just where they are measured Piece 6 is the coolant temperature sensor Piece 12 below is the head and crankcase temperature sensor The display is of oil temperature Cooling circuit
White puffy smoke out of the exhaust - BimmerFest BMW Forum The B58 engine PCV valve can be changed out with after-market kits, although BMW makes a kit also (the BMW kit is expensive) One symptom of failing (or failed) PCV valve is the engine will run fine if cold, but runs rough once it warms up