28v6, do you know anything about the AAR engine (1994 100)? any problems?
i used to own a wc motor (100GLS5E)years ago. not much has changed with the layout but the injection and ignition systems are a hell of a lot more modern, ie they actually have electronic controls...
TurboDsm86, in South Africa that model had problems with the auto box (can't remember if yours is auto?), not sure if that info is relevant for the rest of the world, as a local branch of ZF manufactured the gearbox here, but still worth checking.
another thing with ALL audi's, even the new one's, the power steering can give trouble. That warning i had from audi themselves, three different dealers without prompting them.
if the engine has cracks between the cylinders then you should lose compression in more than one cylinder, unless the crack is into one of the water jackets. in which case you 'should' get oil in the water/water in the cylinder, water in the oil etc... 28v6 is also right about the turbo's, always or should i say ALWAYS let the car (turbo) idle down after driving. reason, the turbo is lubricated from the engine oil, switch the engine off and no more lubrication, however the turbo is still spinning at 80000rpm, so guess what happens, the turbo spindle says tally ho and leaves you with a nice mess. take note on the manifold cracking, this was caused by the vent (dump) valve either failing or sticking. pressure gets too high and your manifold waves a fond farewell...
. if i were you get a haynes manual and give the car a thorough going over. find a decent local mechanic that is willing to give you advice.
also guys in a forum can only give you advice based on what you tell us, whereas a mechanic can look at the car first hand.
28v6 did that lot sound about right? (amazing how difficult it is to try and help without actually looking at the car!)