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wtf did my oil go

Discussion in 'A4/S4 forum(B5 Chassis)' started by voteforpedro, Mar 15, 2010.

  1. voteforpedro
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    voteforpedro Member

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    Oil light keeps coming on and I only changed the oil with 4.5 fresh litres about a month ago. There are no leaks and no oil in water. I checked the oil level yesterday and it was kind of low...
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  2. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator

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    Oil light doesnt mean its low, it means theres no pressure.

    Fix it, or the engine will be scrap.
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  3. Blue_Thunder
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    Blue_Thunder Active Member

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    Knackered turbo seals causing the oil to be burnt and expelled out of the exhaust?
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  4. Broken Byzan
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    Broken Byzan Photographic Moderator Staff Member Moderator

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    well, you saying you only check it once a month? Also you wont have fitted 4.5 litres in there as the capacity is a tad over 3.5 L. My best guess is you have a high ish mileage engine and its either being burnt by the engine or passing by the turbo seals in small quantities so you don't see the smoke
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  5. Broken Byzan
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    Broken Byzan Photographic Moderator Staff Member Moderator

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  6. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator

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    Our old engine used about a litre every 2000miles.

    There was just enough in a 5L bottle, to do the oil change, then top the engine up for the next 5000miles and it would be on the min line when the next change happened.

    Still doesnt explain the oil light though.
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  7. voteforpedro
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    voteforpedro Member

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    So... new turbo?
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  8. Broken Byzan
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    Broken Byzan Photographic Moderator Staff Member Moderator

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    if you dont sort it soon, it will be new engine AND turbo TBH

    How many miles has she done?
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  9. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator

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    The oil light means the engine has no oil pressure. This is usually down to sludge and a worn oil pump.

    No (or low) oil pressure will also damage the turbo over time.

    If the oil light is genuine (ie it isnt just a faulty sensor or you having run out of oil), you will need to remove the sump and fit a new oil pump, as well as cleaning everything out.

    It might be worth trying a diesel flush before stripping it down.
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  10. voteforpedro
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    voteforpedro Member

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    I did a diesel flush with the oil change last month. I will double-check oil level in an hour when I leave work. Not looking forward to removing sump, having read the other thread...

    @byzan: mileage is ~138k
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  11. voteforpedro
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    voteforpedro Member

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    What's the difference between 10w40 DIESEL oil and PETROL oil?
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  12. voteforpedro
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    voteforpedro Member

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    I remember I put a little diesel oil I had lying around while I was fast idling it with some diesel. I then drained this out and changed the oil filter. Could this be a possible cause?
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  13. voteforpedro
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    voteforpedro Member

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  14. voteforpedro
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    voteforpedro Member

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    Light didn't come on on drive home... I'm hella confuzzled now.
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  15. voteforpedro
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    voteforpedro Member

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    No light on way to work today. I am thinking it might just be the sensor then?
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  16. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator

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    Do yourself a favour and get a real pressure guage on there. Mine was 25quid on ebay and it gives you a much clearer picture of whats happening.

    Theres a possibility that your diesel flush has dislodged some ****, which is now blocking the pickup pipe, so it might be worth doing another change, especially if the oil has gone black already.
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  17. Blue_Thunder
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    Blue_Thunder Active Member

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    Was the DIS light yellow or red?

    Yellow = Oil low
    Red = Oil Pressure
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  18. voteforpedro
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    voteforpedro Member

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    Red mate.
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  19. aragorn
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    aragorn "Stick a V8 in it!" Staff Member Moderator

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    only immo3, 2000model year and newer cars have level sensing, so any oil warning on an earlier car is pressure!
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