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As a n54 owner.... Maybe i can help.
Fuel additives used in the us produce octane but use alcohol. This is hard on the seals on the pump. I have almost 70k on my 07 335 and I upgraded the fuel pump after using alcohol based fuel enhancers to boost octane. I believe that the ethanol found in @ 50 % of all fuel types may be facilitating these failures. Try High grade premium. Shell, Hess, 76. BP uses ethanol and our dealership has an account with them to keep the bimmers topped off so that can't help keeping a full tank of e10 sitting until they are sold. There are products now designed to keep the car protected from the ethanol so I use a little of that every month and no convenient store gas.... no matter how good the price. stick with shell. It can't hurt.
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JB4 beta 15 ohms FSB,AEM inline filter/ CM 10, ETS fmic, ER custom made charge pipe,TSW Donnington 18's,Simitumo HTRZ3, Injen DCI, AR DPs, Forge DVs, AA SLD, Koni FSD, ZSP springs.
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