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compression test and leakdown test. these are your friends.
a low cylinder will show you a few things, compared to several good cylinders.
there are several things to consider:
does your car sit for long periods of time? do you NOT let the engine heat up prior to driving? do you live in a high humidity environment? each of these things would lead you to condensation in the crankcase, releasing (vapors) as the engine heats up.
If you run a compression test, and find a low cylinder, you may have one or more things happening: broken/bad rings, broken piston, blown headgasket, cracked head/block liner tower, bent valve(s), etc......
when the car is running, pull the oil fill cap off and look at the vapors. does the vapor pulsate----puff, puff, puff....? if so, you more than likely have a broken ring/piston situation---rather than a blown headgasket.
are you running an air pump (smog pump)? this will cause the crankcase pressures to be worse.....if you have internal engine damage.
oil in the radiator is not necessarily a blown headgasket. it could also be a bad oil cooler (in the radiator). blown headgaskets usually tend to put lots of oil in the radiator and lots of water in the crankcase, making the mix a milky color in both departments---check both.
you need to gather more info before you do a tear down hunting this problem.
Good luck--
--Russ
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Absence of Evidence, is not Evidence of Absence.
Bill Maher 8/4/09--- "I'll show you Obama's birth certificate, when you show me Sarah Palin's high school diploma."
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