2004 A6 2.7 TS - Service issues - Rough idle, loose seat, etc...

Hi All,

I was wondering if anyone has had similar issues with their A6's:

1.) Rough cold idle - Dealer claims service bulletin advises customers to
use lower octane (87) gas to solve the issue. Dealer refused to provide copy
of the bulletin. This makes no sense to me as higher octane gas is required
in the owner's manual, and has a lower flash point, should burn easier ???

2.) Loose driver's seat - dealer claims this is a known issue that Audi
refuses to repair - Again this makes no sense to me on a brand new $45K car
???

3.) Dealer made me pay a premium to use synthetic oil, and claims Audi does
not require synthetic in A6 2.7 TS - this is odd as a turbo charged engine
usually benefits from synthetic.???

I bought the car from this dealer, who is the only audi dealer in a few
hundred miles, so I cannot confirm what they communicated to me.