ChatterBank0 min ago
creamy residue under oil filler cap
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For more on marking an answer as the "Best Answer", please visit our FAQ.When I worked with Rover cars we used to have quite a problem with this. It was often caused by additives to the oil which meant that on short runs (i.e. engine not getting hot) condensation would form within the engine and form the mayonaise sludge.
First thing I would do is try and clean the sludge out. If you have an airline then pressurise the breather system. I would recommend changing the oil as well to a different brand.
Also, can you confirm that the car is used for short runs?
I would avoid changing the head gasket until you investigate this further. It's an expensive job for something that could be as simple as condensation!
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