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Originally Posted by JCL
You are much better off using good fuel, with sufficient additives, but as that is not always possible there are additives available to correct problems associated with the build-up of deposits. BMW recommends not using additives, but they acknowledge the need in some cases. I just wouldn't ever use them as a preventative measure, given the other problems they can cause.
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Listen to JCL. He knows his stuff when it comes to this. It is much better to get good gas like Chevron or other fresh fuels with good detergents every time you fill up then to buy second grade fuel and then try to remedy the issues with fuel system cleaner.
I also noticed about a year ago that the BMW fuel system cleaner I paid twice as much for from the dealer was manufactured by Chevron. I won't ever buy it from the stealer again.