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will it do any damage

Discussion in 'A4/A4 cabriolet/S4 forum(B6 chassis)' started by TURBOTRONICS, Feb 1, 2012.

  1. TURBOTRONICS
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    TURBOTRONICS Member

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    [Feb 1, 2012]
    if i put 15w40 in my s4 for a week or so will it do any damage
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  2. V8Guzzler
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    V8Guzzler Member

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    [Feb 1, 2012]
    I used 15w-40 on the advise that it would stop chain rattle as its thicker... yeah it worked for a while, but using the incorrect oil can lead to all manner of issues long term - why just a week out of interest?
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  3. V8Guzzler
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    V8Guzzler Member

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    [Feb 1, 2012]
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  4. TURBOTRONICS
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    TURBOTRONICS Member

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    [Feb 1, 2012]
    i bought some oil intended to do an oil change on my s4 but as it has the dreded rattle i thought it would benefit from a thinker oil but my mate that has is own garage said this was bull **** and i could ownly put castrol edge in it and when it takes 10l to fill it i thought other wise but i have it now i wanted to put it in till i can afford better oil
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  5. BlackQuat
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    BlackQuat Well-Known Member VCDS Map User

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    [Feb 1, 2012]
    Would certainly work as a cheap flush oil. I would say if it's only for a week and you're not planning on thrashing it. It'd flush the car out quite nicely.

    On another note 10litres in the v8?!
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  6. dsmclark40v
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    dsmclark40v Member

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    [Feb 1, 2012]
    15w40 is a semi synthetic isn't it? I wouldn't use that personally as it needs fully synthetic and not that i know much about oil but i think that 15w would be too thick. Audi recommend 5w30, but 5w40 is what most people use to stop the chain rattle at start up. The v8's need a thin oil really.

    Put the 15w40 on ebay or in the classifieds! Better to sell it at a loss than wreck the engine
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  7. dsmclark40v
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    dsmclark40v Member

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    [Feb 1, 2012]
    A litre a cylinder is the normal guideline for most cars. The s4's have a bit more, takes just over 9L
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  8. V8Guzzler
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    V8Guzzler Member

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    [Feb 1, 2012]
    Here's an example - we'll use 5w30. Which is actually "5 winter 30". At cold temperatures the oil won't thicken up more than straight-5 weight oil, and when hot, the oil won;t thin out more than straight-30 weight oil. 40 means its thicker at operating temp than a 30. if you use a 40 weight in an engine that calls for a 30. you can ruin your engine as the thicker oil cant get to all the places in the engine that it should. so use what the car calls for....

    :beerchug:
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  9. BlackQuat
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    BlackQuat Well-Known Member VCDS Map User

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    [Feb 1, 2012]
    Might Have to do some reading. I was told 4.5 for my v6. Best check that! I need a v8 :(
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  10. jutlis 3.0
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    jutlis 3.0 Member

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    [Feb 2, 2012]
    i would agree dont do it and as for the chain rattle although it seems bit of a characteristic of the engine mine used to do it a bit and then started running bad and after stripping it down we found 2 broken guides, its all done now and no longer rattles
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  11. rjm180
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    rjm180 Member

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    [Feb 4, 2012]
    Glad your car is sorted now jutlis. Must be great now with all the work you have had done to it.
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  12. jutlis 3.0
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    jutlis 3.0 Member

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    [Feb 4, 2012]
    so far so good just very paranoid at the mo and keeping an ear out for any strange noises etc! altogether had new chains/guides/tensioners/clutch/flywheel/rocker gaskets/oil cooler/crank and temp sensors/2 injectors/8 coilpacks/spark plugs/fuel filter etc etc.......phew! some needed, some precautionary
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