Can we run 89 octane in a 99 1.8tq? I don't get to drive it much these days (wife does) and with the gas prices up, she's been putting a bug in my ear about trading it in for something that will run on 87. So I'm tryng to compromise here..

 

No that is not recommeded. It won't kill the car a tank here and there, but in the long run it is not a good idea. Audi's are designed to run on 91 or greater octane.

 

Agreed! Don't put 89 in your baby! Also consider how much money you REALLY are spending at the pump. Here in wisconsin it is 10cents give or take a penny more for 91 octane over 87 octane. Now think how many gallons your put in per stop..roughly 15. 10 x 15 = $1.50. Fill up once a week prolly..so that's what 6bucks a month you'd save on gas...common..gimme a break..you prolly got that lyin around in your couch!

-T

 

Tru listen to them....

over time your gonna kill your engine and it WILL "knock" on you....not worth the mere savings at the pump.....

I know its tough sometimes...I live in L.A. Ive paid upwards of 2.85 per gallon for 91 oct!!!!!

Its gotta be cheaper where you are....


T. Pres

 

an extra 10 cents or whatever a gallon wont hurt and ur car will run better, dont switch

 

Trust me fellas I found out the hard way once already over running 87 octane in my car.. It cost me 240 buxs, plus plugs.. So I'm not looking at doing that again.. I would prefered to spent that on something better like saving for a chip and DV..

 

Low octane gas will harm the combustion chamber of your vehicle, burn up your plugs, and ruin the cat and o2 sensors over time (a long time). The a4 (1.8t) needs high combustion temperatures, and with low octane fuel that temperature is not reached before combustion. This early/uncontrolled detonation is called "knock".

It will pit your combustion chamber. It will not completely burn off the fuel cleanly, leaving extra residue in your Cat, and will foul your O2 sensors.

But hey - if you want to save an avg of $80 bucks a year by using 89 octane, by all means...[8D]
Personally only put in 93 (94 if I can get to a Sunoco)

 

I've used 89 octane in my 2001 1.8t for the last 4 years. I tried 93 and didn't notice any difference. I have 72,000 mi. now. The computer compensates with retarded spark and less boost.

 

Sigh, you know it's bad for your car, yet you continue to do it?

 

The AKI must be 87 or higher, audi recommends premium unleaded - 91. You can use 87+, it just recommended using 91, 87 wont hurt the car but you'll probablly notice a slight loss of power.