I filled up today with B5 at a Sunoco, didn't see the sticker until it was too late. But from what I've read, BMW is ok with up to B5. I'm going to check the Hess by my office once I've run the 520 miles it will take to empty the tank of the B5

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You have your way. I have my way. As for the right way, the correct way, and the only way, it does not exist.