Lets try this again....can anyone tell me what the maximum octane fuel that can be run in a 2005 c-230kompressor? For example, would 100+ octane unleaded racing fuel damage anything?Thx....
it shouldn't do any damage, but you are just wasting your money. if you don't have a tuned car the ecu can't even tell if it's running 91 or 100. even if it is tuned we don't have the chip like GIAC for Audi where you can store multiple octane setting.
__________________
2002 M112K with lots of mods
2008 M272 with some mods
Vehicle: 2003 C320 Coupe\71 220 gas, 4-speed\95 Talon TSi AWD\97 J30\79 GS1000S\80 SR500\'69 Datsun 2000
Location: glorious Galt CA
Posts: 83
Higher octane rating = more additives = more by-products of combustion = more deposits.
Oh, and there's the wallet crater, too.
We're mostly getting along okay with whatever that "91" junk coming out of the gas pumps in California is. It's just a little odd for some of we still-stumbling dinosaurs when we realize no one under thirty really knows what gasoline smells like.
Ok, thx for the replies!!! And yes!! California fuel IS junk. (Have another name for it, but not printable) Had a Jeep, 15 mpg in Calif, we go to Washington state occasionally, and the Jeep would invariably get better mileage up there, sometimes as high as 5 mpg better. Anyway, I'm going to experiment....and see if I can improve the mpg of the kompressor with some 100+ octane. Will post when I get results. It's worth a small "wallet crater" to find out. Thx.....
Not what you are getting, however, I have a 50 mile commute one way that involves a long stretch (10-12 miles)of 6% grade, with a 10-12 mile stretch of 2-3% grade on both ends. Mileage varies, averaging 27-30. Remember, it's the California fuel that makes for the poor mpg. It's a matter of curiosity...
maximum octane permissible 
Linear Mode
