5,000 k's for oil top up is quite common in low friction engines, not a big deal.
I'd get the dealer to work through the usual suspects for misfiring, plugs coils, injectors etc.
It is 4 years old, so for only 55'k its been sitting around a lot or even worse doing short city trips.
I'drun a couple of tank fulls of 98 through it as well.
If you haven't already, take it for a long run on the freeway, for at least 2 hours, clean out the crud.
We never had a problem with ours in 100,000 k's, so don't panic, they all don't have problems.
Cheers
Gary
Golf Mk7.5 R, Volvo S60 Polestar, Skyline R32GTST
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