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2.5 TDI started smoking since service.

Discussion in 'A6/S6/Allroad forum (C5 Chassis)' started by Ant1984, Feb 8, 2010.

  1. Ant1984
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    Ant1984 New Member

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    [Feb 8, 2010]
    I changed the oil, oil filter and air filter yesterday, it seemed fine at the time and afterwards but now smoke with a blue tinge (burnt oil) is coming from the exhaust, not loads but it wasnt there yesterday.

    Is this somewhat normal after an oil change on a high mileage diesel or is it something else?

    I appreciate that it could be something devastatingly bad but is there any smaller, cheaper things worth checking first?

    Just had a search, seems maybe the EGR valve should be cleaned out, but this doesnt really solve the problem of why it has started just after a service.

    Many thanks

    Ant
    Last edited: Feb 8, 2010
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  3. John C
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    John C Member

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    [Feb 8, 2010]
    Hi Ant1989
    To see if your EGR valve is blocked remove your oil filler cap & listen for a 'pop' of pressure being released. I had the problem & it seemed to come on all of a sudden & perhaps the oil change is coincidental.
    John C.
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  4. Ant1984
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    Ant1984 New Member

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    [Feb 8, 2010]
    Thanks,should the car be running or not when I remove the cap.?

    It actually seems to have settled down a bit I don't know if I might have slightly overfilled it, it was maybe 1mm over the max mark. I've done that with a lot of cars with no consequence, are the tdis very sensitive to overfilling?
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