I've had that white, foamy crap under the oil filler cap since I bought the truck ten years and 150K miles ago. Dodge says it's normal. Can't say I agree, but, I've never had oil in the coolant or vice-versa.

Is it smoke, or vapor? True white smoke is oil, not coolant. And if so, you should have fouling on your spark plugs.

 

Yeah, it's the "normal" crappy PCV system condensation hehe.

 

Thanks to all who provided help/suggestions. I did wind up having the head gasket replaced ($2200). I'll be taking it back for a quick check, due to the heater not pushing out hot air. Maybe needs a new thermostat? Not sure, but I think this will at least be a quicker, cheaper fix. Thanks again guys.