Milky substance on my oil cap

SouthArk370Z

Check the dip stick. If level has risen since last check, you probably have a coolant leak (eg, head gasket). As much sludge as there is, this would be my first guess.

If it's condensation, an hour long drive should get rid of a lot of it.

In any case, you need to change the oil and filter. But fix the problem first.

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