this is for a 2001
http://www.audiusa.com/model_library_results/0,3196,0-1-2001-1-0-0-0-1-0,00.html

Fuel requirement: Premium unleaded (91 octane) recommended for maximum performance

 

lol, i put 87 in my moms 04 5 series as an experiment when i had to go fill it up, her sh*t pinged and the check engine light went on, dealer drained the tank and told me that the super i bought must've been bad.

 

I really wasn't gonna chime in, but you took the words right out of my mouth. And thats what mine says to.

 

do you guys know that in the manual it basically says that if you beat the **** out of the car (1.8t) you should let it cool down before turning it off. and all this time i was seeing how long i can redline and let the turbo spool like a ****, till it glows red like the dunkin donuts sign and then shut it off to hear that fascinating ticking sound of crystalizing oil and cooling exhaust.

 

Different measurements of detonation resistance. There's the Research Octane test (RON) which generally yields higher numbers, and the MON (Motor Octane test) which generally yields lower numbers. America uses it's own special octane measurement, (RON+MON)/2 or PON, Pump Octane Number. What you're putting in your car is 98 RON, which is between 90-93 PON, so you're no different than us, you just think you are.

I don't understand why people are defending the lower octane arguement. Except for Heinz, who obviously knows his **** and has empirical data to back up his reasoning, why in the fvck are you guys bragging about saving $2.50 a tank and risking holes in your cylinder walls when the weather gets hot or you get rev-happy in your car? I guess you'd be OK with 89 or 87 if it wasn't really hot outside or you were driving like your mom, but why? If you think you're cheating the system or sticking it to the man by not paying two extra bucks per tank, you aren't. You are a self-important, deluded douche. There's no advantage to running lower octane than recommended, especially on a FI engine.

 

I was running water injection for a while. 89 with water injection is WAY better than 93.

 

I use 89. I'm not chipped and the owners manual says only performance will suffer. I've tried 93 and didn't notice any difference.

Mobil 1 every 10K mi. It doesn't sludge or coke.

 

Mobil 1 every 10K miles? Jeeeeeeeebus
Going past 3500 miles for me is ... well... I just couldn't do it. 5100~ km is the most I have EVER gone on a single oil change.
Knowing that the sludge issue is real... why risk it?

 

I'm not risking getting sludge. I remove the dipstick every 1,000 mi. , and rub oil between two fingers to make sure it's smooth. So far it has been good for 10K mi.

 

you only do it every 1k milws. How about every oil change.