Sounds to me like a bad head gasket, almost a dead giveaway when theres the white foam/slime on the oil filler cap, stick your finger in the coolante resevoir and wipe aroudn with your finger, does it come out with oil on it? Perform a compression test. There is no way for condensation to get in the cap, plus if it did it would be able to come back out.
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Tuesday, January 1st, 2008 AT 5:40 PM