Question about 1998 Audi A4

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Audi A4 2.5 V6 TDI - Creamy grey coolant in expansion tank

I've found the expansion tank full of a creamy grey liquid.
The level was normal, but the coolant warning sign had come up on the central instrument cluster display. This comes up for either coolant high temp or low level. I drained off some of the grey liquid and put water in. The warning sign has gone away.
Is this an oil cooler leak, or head gasket ?
No steam coming out of exhaust and now low coolant level.
Cheers, Kevin

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  • Anonymous May 02, 2009

    My temp gauge came on followed by my oil light (after about an hours drive) so checked oil first, which was fine, then checked coolant tank. It was full of light brown sludge. My first thoughts where head gasket but no water mixing with the oil, there is however, oil is mixing with the water.

    any ideas?

  • Juan-michael Ferguson Jun 05, 2014

    you have blown head gasket, the creamy substance is oil mixed with water

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Replace head gaskets, have head skimmed, do not put gaskets on if head has not been skimmed.

Posted on Jun 05, 2014

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I have 2004 a6 v6 tdi and suddenly recentley noticed the water had gone down in the rad top up bottle,the oil is as normal and i can't find any leaks, no water on drive there is no oil in header tank,car done 90k with fullaudi sh

Posted on Jan 05, 2010

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Sounds like blown head gasket (or worse) still to me.
Remove oil filler cap and look for grey oil.
Never use water these days but special coolant. Water makes vapour spots and cause block cracks, worse then blown gaskets!!!
vapour does not cool very well.
Look like you have cracks already.
Take a compression test if possible. But might not show op at that temperature.
The gauge indication troubles me.

Posted on Apr 14, 2009

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