If you haven't bought it yet, take it to a reputable VW dealership and get a pre purchase inspection done on it. With the miles that are on it, my first thought is that the injectors are worn out or are on the way there.
Get a sample of the oil and send it out for analysis. That's going to tell more about what is going on than anything.
These engines are excellent for SVO/WVO.
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Volvo WIA42 VED-12 / 335 hp / 1300 ft/lbs / 9 mpg
Big n' Boxy, Never met a Hill it Didn't Like
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