93 here, have to with a chip, but feels better to use it even if you don't.
__________________ PRESIDENT OF THE OVER 10 YEARS OLD AND UNDER 100K MILES CLUB
1993 325i 5spd
Benfer Performance Intake
M-tech Pedals and Shiftknob
Bavarian Auto Floor Mats
Wheelskin Steering Wheel Cover
Panasonic Head Unit
Euro Projector Lights w/ black Housing
Black Housing Clear Corners
MORE TO COME!!
A magazine, either car and driver or motortrend, I dont remember which, did a test comparing how different vehicles performed using various grades of gas. The cars tested ranged from honda accords to m3s. The cars were fed 87 for two weeks and then dyno tested, and then switched to 93 and dynoed again 2 weeks later. With the exception of one car, they all performed better with the higher octane. The accord did better with 87, but even honda admitted that it was probably a fluke, and the minium the accord should have is 89. The article also discusses how even if a car needs to run 91, as it ages it is better to upgrade to 93 to compensate for wear.
In sum, 93 is the best, and should be had all the time, espcially if you have high miles.
__________________ <span style='color:gray'><span style='font-family:Courier'>1995 e36 3 Series RIP
1999 e46 3 Series BURN IN HELL
2000 MR-S Roadster= Current</span></span>
Replys are all interesting. Everything I've ever read indicates that you should use the octane recommended for the car...period. Higher octane shouldn't improve performance as its only benefit is to control early combustion in higher compression ratio cars and it doesn't provide more power (i.e., if you want to make a bomb, only use super unleaded 'cause it packe a bigger wallop? I don't think so!) . If you're supposed to run on regular and your car is older and only running well on super, then you've probably got carbon on your heads that's heating up the cylinder too much (or it's out of tune, or someother fixable item to bring the car back into spec).
My BMW owner's manual says you should use 89 octane, but you can also try 87 and if works well, then stay with it.
Wondering if those articles that ran the tests on the different grades of gas actually measured a substantive improvement in performance or was it only something like .0000001% better?
Also the comments re: different brands of gas and which is better always amuses me. If Shell watered down their gas don't ya think we'd read about it in all the papers and magazines rather than via rumors. I love urban legends!!
P.S. - Messrs Ridge and Ashcroft, if you're reading this, the bomb comment is only illustrative. I'm really really a proud American!
__________________ <span style='color:green'>1994 325i </span>- - - 75,000 mi.
No mods - - - very happy as is!
<span style='color:green'>1995 525i </span>- - - 154,000 mi.
No squeaks or rattles... unreal!
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