Question about 1995 BMW 5 Series

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No problems, just want to know what grade of gas to use (reg., medium,or premium)? Does it matter, will it affect engines performance? Just bought a used 1995 525i bmw sedan, automatic . Thanks

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Just bought a 95 525i. It is not exactly overpowered in the horsepower department. I was talking about that yesterday with a BMW mechanic. He said to use "the good stuff" i.e. 93- yes it costs more, but your MPG will be somewhat higher, and your engine should be a little more energetic. He said to stay away from the warehouse gas places- Costco, Sams, and Sheetz. They tend to have a high percentage of ethanol in their gas, which will eventually destroy your catalytic converter... as time goes by, ethanol is getting harder to avoid. The gas station should have a sign saying if their gas has ethanol, and what percentage. You can use it if you have to, but don't make a habit out of it.

Posted on Feb 12, 2011

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1 Answer

Ideal gasoline


87 octane is ideal for your accent.

It's a little commuter car. It's designed to save you money.
Anything over 87 is just a waste of money, UNLESS your engine is knocking at 87. Then you should step up to the next highest grade.
89 is a made up octane. It's just a mix of the lowest grade and the highest grade. I used to work at a mobil gas station for a year, and the only grades i knew wer 87 and 93, but 89 was an available option. it's just a way for oil companies to benefit off of ignorance.
91 and 93 is for high performance engines, turbo-induction, superchargers, that sort of stuff.
you should be fine sticking with the 87 though, but move up to "89 octane" or 91/93 if your engine knocks a lot.
hope this helps.

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