I have an 06 MS6 and had the smoke issue after I put a downpipe. My dealer was awesome enough to do the warranty work to replace the turbo. In the manual it states that after long drives or using or the turbo you should wait 30 secs at idle before shuting off your car to let your turbo cool. I wondering if shutting down early causes some sort of heat stress on our turbo seals.....time will tell.
That's funny because my manual specifically states that the car does not need to idle before shut down. It also states that the car does not need break in and does not need to be warmed up before driving.
'06 MS6 41,000 miles -- no smoke.
I have a 07 MS6..I have put on CP-E CAI, HKS SSQV BOV recirc, CP-E duel catback exhaust, CP-E rear motor mount, and SU test pipe...I have 14500km's on it with no oil consumption or smoke...I think the key thing in these cars is proper warm up( don't bag the sh*t out of it when it's cold) and proper cool down...(don't just shut your car off after beating that G35 or a highway run...let it run for 5 mins and cool down properly)...people who race and then just shut the car off no kidding have blown turbo seals....just my 2 cents...