This is the third time my 740 starts smoking blue after 5 minutes of idling. It starts smoking for a minute and then smoke dissapears completely. It does it when it sits for a overnight. If you drive it and then turn it off and restart after let's say half an hour it does not smoke, so I don't think it's the valve seals (they where replaced when I installed the squirter block.) I am using an upgraded T3 turbo. Do you guys think is time to replace the turbo? PCV system is clean and there is no noticeable blow-by. No smoke in accelertion or decel. Engine uses almost no oil after a 200 mile trip, is just a minute of smoke and then nothing.