Taste it would be the best way to see if its antifreeze or just moisture, if it doesnt taste sweet like antifreeze, then chances are its just moisture that has found its way into the crank case and when the vehicle is running it vaporizes and finds its way to your cap.
Try some seafoam for the crankcase after an oil change.
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Monday, April 14th, 2008 AT 11:35 AM