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No receipts doesn't bode well.
I'd look at the chap and the brand of tools he has and how he looks after the tools.
Also what works has been done, beyond oil fuel ,air and cabin filters. Look at the cabin filter, if it has one, to see what nick it is in and the make. Look at the oil, air and fuel filter brands to see if they are decent oe quality or some lower quality stuff.
Was anywork done that needed special tool to do. Did he buy the tool or is the tool available from an owners club. Lastly look at things that need to be removed to service the car such as undertrays or engine covers, are all the fitting there and undamaged.
That is the way I guage cars.
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Plot thickens actually. Previous owner did all his own wrenching - was a mechanic apparently. Current owner has only had it six months but "now wants a van" hmm. A few red flags... but I do like it.
https://www.carsales.com.au/private/details/Audi-A4-1999/SSE-AD-5326418/?Cr=0
Yet another bit of speculation: a B5 Audi Avant 1.8t (132kw version) quattro. It's a 99 car, extremely rare manual and unmodified. Only catch is the owner has serviced himself for last 5 years... Might mean it's better though, just no receipts. And 229,000 kilometers. Looks to be in great condition. I always liked the B5, good wide and low stance. I'm guessing it'll be a case of timing belt may need doing and a bunch of suspension stuff, but then engines are meant to be rock solid and understressed in factory spec. Hmm...