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post #1 of 6 Old 07-28-2005, 03:42 PM Thread Starter
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gas type

this isnt about jeeps but my freind just bought a 96 m3 bad *** car and he was curious with gas prices and all if he could put regular and not supreme in it

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post #2 of 6 Old 07-28-2005, 03:51 PM
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my dad has a brand new 325 ci and he told me never put anything in it other than suprmeme. I guess the guy at the dealer told him that if you go with anything less than that, youll hurt the engine. I guess something with the perfectly fine tuned engine in a BMW and the temperature it runs at, that they require the higher grade gasoline. i wouldnt risk it thats for sure. at the least youll lack hard core power and gas mileage. thats just what ive been told.
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post #3 of 6 Old 07-29-2005, 09:06 AM
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Actually, if it doesn't cause any ping or knock, you'll get BETTER power and gas mileage by using a LOWER octane fuel. You should use the lowest octane fuel that runs well in your engine.
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post #4 of 6 Old 07-31-2005, 01:38 AM
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The thing is, on a newer engine, it has a knock sensor, so if there is knock, the computer will retard the timing to prevent it, so you won't hear it, if you do, then it has to be pretty bad.

While I do not like BMW that much, it is still an expensive somewhat luxury car, you don't drive one of them to be cheap on parts and maintenance, and the whole $2/fill up really isn't worth it, if the manufacter says to use premium gas, then I would strongly recomend that you use it.

The Caddy requires Premium, and that is all she has ever got, I don't think twice about it... it is a premium luxury car so naturally it'll need a little more then a typical Chevy.
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post #5 of 6 Old 07-31-2005, 12:58 PM
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The M3 has an 11:1 compression ratio, I wouldn't go with anything less than 93 for maximum performance.
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post #6 of 6 Old 08-05-2005, 02:44 PM
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The octane rating is an anti nock rating. With high compression engines and engines with power adders ie turbo, superchargers and nitrous should use high octane. Due to the fact that detonation can accure other wise. The higher the octane rating the higher the flash point or heat needed to ignite. 87 octane needs less heat were 93 requires more to ignite. So the lower octane is fine in lower compression engines. But if I was your friend and didn't want to blow my engine up and have to fight the dealer to try to get them to fix it. I would stick with high octane fuel. Whatever the manual says.
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