Damn it where's 7th gear when you need it?!
By any chance do you drive a 1.8T? There's a frequent problem with this engine relating to sludged up oil pump giving intermittent problems. Suggested fix i've heard repeated many times is to have the pump removed & cleaned, flush the engine & replace the oil feed pipe to the turbo. Not expensive as only a couple of hours labour, any competant mechanic should be able to do this so you can avoid the main dealer!
A4 3.0 Quattro Sport - Gone & missed everyday!
Current road going missile.....
........Smart Roadster - arguably the most fun you can have in a car without using lube!!