I'm not sure if this is oil quality/specification related but I thought that I would bounce it off you all. Have a 2006 750LI here that if left idling for 10+ minutes it will begin to smoke out of the exhaust (a fair amount of smoke). This smoke is blue and definitely oil related, smells like burning oil as well. It will not smoke on start up fyi. This vehicle was just at another facility for correction of this concern. They had replaced the PCV diaphragms and I believe that the PCV system is functioning correctly. Pulled all spark plugs and inspected, they all look perfect, brand new, so no direction here. Im wondering if too thin of an oil has been used in this engine or potentially the wrong oil in general. I would think that a 10w40 or 15w40 would be good in this engine, T6, AMSoil, Castrol, etc... Any thought? Thanks