Quote:
Originally Posted by pelo911
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Do NOT use E85 - our cars are NOT equipped for it! It has a higher octane rating than gasoline, but has only about 70% the thermal energy, which means you lose a significant amount of miles per gallon. It can corrode the seals in your fuel system and is hygroscopic, meaning it attracts water, which is not good for your fuel system or your engine. If our cars were capable of using "Flex-Fuel", as ethanol-based fuels are known, it would be prominently indicated in our owner's manual and very likely on the inside of the fuel filler door as well.
There will be several replies here stating that this is BS, that they use E85 all the time with no ill effects, etc. Anybody's welcome to put whatever they want in their fuel tank, but it doesn't mean it's the right thing to do. If BMW doesn't specifically say you can use E85, I would not use it - you could end up with a very expensive lesson in following manufacturer's recommendations.