Would it be ok to run 89 octane in a 2.8, would using 91 make a big diffrence when concerning furture reliablity, thanks so much

 

It is fine, I dont beleive it will hurt the engine unless it runs below the 87 grade level, but the manual recommends 91+ octane. If I am wrong please someone correct me.

From the manual: The recommended gasoline octane rating for your vehicle is 91 aki / 95 ron. Do not use any fuel with octane ratings lower than 87 aki / 91 ron otherwise expensive engine damage will occur. Your vehicle may also be operated by using unleaded regular gasoline with a minimum octane rating of 87 aki / 91 ron. However, using 87 aki / 91 ron octane fuel will lead to a certain loss of engine power.

 

What does your owners manual say? It's not worth the 1.50 per tank you are saving to go against what the manufacturers of the car recommend. Thats all I say.

 

Audi recommends 91, but no lower that 87, im really just wondering if 89 might cause problems after constantly using it for a long period of time, thanks for your input, and I suppose i should just play it safe with 91

 

To tell you the truth I had a period where I had to run 87. It ran fine for the two months with no problems what so ever.

 

Always use 91, better yet 92, I have necer tries 87 in it, but truly don't want to find out what might happen.

 

Look here: https://www.audiforums.com/m_636476/tm.htm

This topic has been discussed to death already.

Jeff

 

Wow, your not kidding!! but very informational and interesting, now im most definitely sticking with 91

 

I definately notice a certain loss of power with 89 octane. It's worth the extra couple of bucks for the better driving experince.

 

I have never used 89... stick with the best for the best, its only a couple more dollars no matter what car you drive..............