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Wonder what the v6 on stage 1 would be like? The car I really want is an RS6 but probably will never happen, I'm keeping my eyes out for an early 2000's S4 wagon, they just look so good.
If you look at Audi service menus, anything bigger than a 2L just costs more or has a "please call us".
Ultimately inspect the car you buy, I purchased my A4 from Inverness but had someone local to check it out. If I was buying again I'd go with an obd2 scanner, they can tell you a lot, especially with Audis.
If it's any help I have a 2015 A4 Avant 2.0t quattro. It was well specced so even today it feels up to date with all the radar cruise control and auto braking etc.
Performance is great from the 2 litre turbo... A basic tune and it's at golf R territory. Comfortable, quiet and has reasonable handling. You wouldn't want the weight of the V6 up front.
But... Xenon ballast died at 40,000 Kay's - dealer fixed under warranty. That was over a grand.
Dsg and full transmission service consumes about $500 worth of oil and cost about $1800 inc. labour.
Brakes get eaten every 30,000 and are about 2k. I just had to replace the dual mass flywheel at a cost of 3k and the airbag ECU failed. Another 3k to repair. So yah, be careful. Mine had full service history and was an Audi approved used car so had 2 years factory warranty.
All prices are Aussie dollar mind. Probably cheaper in the UK.