I have a '97 2.8QM that has a couple of issues I could use some advice on repairing. My cruise has been out since I bought the car. I figured it to be a faulty vacuum line as all of them were bad. I replaced them all and it still doesn't operate. I recently found that my clutch switch is not working as I can start the engine with the clutch out. Could this be the issue or are the systems unrelated? If no, where should I start looking for the problem? My car has the 12v 2.8 (AFC). It has about 102500 miles on it as of right now and currently burns about a litre of oil between 5000 mile oil changes. Is this normal? I use Mobil 1 5w-30 with Mobil 1 oil filters. I also can hear what sounds like piston slap from the #6 piston under no load conditions @ 2200rpm. Any ideas what that could be? I'm sure I'll be looking for a rebuild or replacement engine soon. That said, I have a couple other related questions to add to this subject. As you know, the 30v (AHA) engine appeared in '97 along side of the 12v (AFC) engine in the a4 line. Can I swap my 12v for a 30v provided I have the correct engine harness and ECM? Thanks ahead of time.