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General rules of thumb:
Low speed engine on acceleration with smoke in the exhaust plume = worn piston rings
High speed engine accelerating (spooled up turbo) with smoke = oil form turbo bearing and/or piston rings
Engine on over run (coasting down, foot off the gas) with smoke = oil from valve guides.
VW/Audi make good engines with tight tolerances so none of the above should apply at 62K miles; just make sure that the oil (the right oil) and oil filter are changed regularly.
sputtering/hesitating i would make a check on the coil and would also check for a vacuum leak. had the boss's wifes caddy doing the same thing, ended up being the intake boot had a split on the bottom side.
check your fuel filter, take an air compressor and blow air through the "in" end if no or little air is coming through then just replace the filter, if fuel filter is ok then try a fuel additive to clean your injectors which are a very common problem when the engine gets gunky build up on them