All Things Mk5 > How to Guides / Troubleshooting

Oil in my coolant expansion tank.

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HandyAndy:
I have been topping up my expansion tank with coolant for ages now and it's gone from every 500 or so miles to every 200 or so miles.

I topped it up tonight and noticed little blobs of black in  the tank. I have assumed this can only be oil contamination and I'm getting worried. It's cost a fortune so far this year and has now got around 178000 miles on the clock.

I have seen in some other forums that it's the oil cooler and it fixes it by changing it, but takes a lot of flushing through.

Any ideas please

Neil 54:
Possibility its your head gasket had this problem on an old car of mine and it turned out to be that you could get a compression test done although not sure if that will show up if the leak is between a water and oil way or only if the leak is into a cylinder

Octoparrot:
Symptoms sounds like head gasket failure to me I'm afraid!

Scottymon:
It's the usual suspect unfortunately

r5gtt:
Doesn't sound promising unfortunately mate. What's the tempreture needle like?.

First I thought water pump as you were topping up a lot  but as I read on I realised it's worse.

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