Blue smoke on startup w211 e320cdi

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mattc

MB Enthusiast
Joined
Sep 27, 2007
Messages
2,938
Location
Midlands
Car
Audi A4, 1994 E320 Coupe, 1995 E300 estate
Have noticed a bit of blue smoke (defo blue not grey or white) from Nat's car on start up. Seems to clear immediately. It's a 2004 with 94k on the clock and comprehensive history.

What's the most likely causes please? Valves seals, leaky turbo. Want to nip it in the bud if possible.
 
Blue smoke is usually engine oil.
It could be valve stem seals, you can check by seeing if it smokes on overrun. Stick it in second and drive at high revs for a bit then take your foot off the accelerator. Normally smokes blue as the revs drop.
 

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