Condensation on the dipstick is something that's been discussed here before and I don't recall it was a big issue. Cooler weather makes it more likely to occur. Get the car up to operating temperature and drive it for 20 minutes or so and I'd expect the moisture would evaporate out of the oil. I don't think this a problem with synthetic oils but I don't have the experience with it yet to say for sure.
The turbo models have an oil cooler that is internal to the radiator. There was a posting recently about someone finding oil floating in their coolant expansion tank. Had to be an oil cooler/radiator problem.
Have any 850 you're considering thoroughly checked out by a competent independent Volvo shop or a dealership's service department before buying. Lot's of little things to be alert for but most are inexpensive or moderetly expensive to repair if you do it yourself. The timing belt MUST be replaced at 70,, flush the tranny every 30k, keep an eye on your shock and strut upper mounts, start saving for better headlight lenses.
Lot's of aftermarket performance stuff for the turbos.
I love my '95 855t,
Erwin in Memphis
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Regards, Erwin in Memphis, '95 855t
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