Greetings all!

Just bought a new 2004 A-6, 2.7T,S-line. The manual calls for premium gas. I've had three other Audis and the dealer (2 different ones) told me it was OK to use mid grade (89 octane). Did so for many years with no problems.

Suggestions for the new car?

Thanks mujch.

Pete Peterman

 

never put cheep gas is an audi....our engines dont like it... it will cause knock in you engine please fill up with 91 or above

 

dont risk it go with 91 do what hb972.8q says

 

Gents: Thanks for the info. As luck would have it the local Enmark station has a discount of 7 cents on premium on Tuesdays. Since I will fill up only once a week most times that will work out very well.

No problem.

Pete Peterman

 

91 octane would be fine. it says so on the gas cap. but around here you can only get 83 octane, 89 octane or 93 octane

i allways put in the 93

 

Your engine will run fine with 89 octane. If your engine doenst "like it" thats because of something else. I run 89 in mine and it doesnt knock, my uncle has an 01 and he runs 89 with no knocking. Anything higher will only give you slightly better performance, better gas mileage, and wont freeze in your fuel lines. If your gas guage says "premium unleaded only" then you should do that. If you are chipped, you definately need 91+.

 

If I run anything under 91, I can tell there is a difference in the performance. Not sure why but I do.

 

You get less performance with lower than specified octane because the knock sensors sense pre-detonation and in response the ECU retards the spark timing. This leads to poorer acceleration and power loss.

 

That would explain why my light comes on when I use anything with a low octane.

 

I've only ever run 93 except for that time when I first got the car and told the attendant to fill it up regular. Wow what a mistake that was the car ran like crap, nad threw a CEL on me.