Sounds like a bad headgasket, since the oil is in the radiator, and the rough low and high idle.
To confirm it do a compression test on each cylinder if one is more then 25% lower then the highest one then the gasket is definetely bad. Its not a tough change but a few thousand job, espeically if the heads need to be re machined.
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Sunday, January 13th, 2008 AT 8:45 PM