Fuel grade in A6 4.2

[Grant Lenahan]

there are times when it will allow more spark advance and thus better efficiency. But not always. in fact, nto most of the time.

I do use it for best performance, and while there is no necessary connection, most premium does contain more additives.

Grant
On Apr 15, 2010, at 12:28 PM, David Giannandrea wrote:

> 
> ALWAYS use premium.
> 
> You will lose mileage which will actually cost more $/mile.
> 
> You will lose performance.
> 
> Your spark plugs will foul.
> 
> My experience: I've seen both my 97 A8 and friends 99 A8 throw engine codes
> when not running premium. It's not immediate, but soon enough. My friend
> bought his pristine 99 A8 real cheap because the previous owner kept having
> to go to the dealer with engine diagnostics. After buying the car, we
> switched to premium and that was that. No more problems. Not to mention the
> false economy of lost mpg. Double this experience with another friends
> Jetta. He switched to premium, Jetta ran better, ran farther.
> 
> David G
> 
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Grant Lenahan
glenahan at vfemail.net