5-Series (E12,E28, E34, E39, E60)Chat relating to the BMW 5-Series of all generations. Specific models include: BMW 518, BMW 520, BMW 520i, BMW 530i, BMW 528i, BMW 530i, BMW 518i, BMW 524d, BMW 525i, BMW 525e, BMW 528e, BMW 540i, BMW 535i, BMW 520d, BMW 525td, BMW 525d, BMW 530d, BMW 525i/xi, BMW 530i/xi. (BMW 5-Series Forum)
Could just be a coincidence, but twice now I have used gasoline with ethanol while traveling and got the 4 running lean trouble codes. My light is on now, but got it to go out the first time by running a few tanks of gas with 1/2 a can of Seafoam. I have 140K miles and assume the Seafoam cleaned the injectors.
Notice also how much HOTTER your engine runs on ethanol.... The heat over and above what is considered normal translates to engine performance degradation & engine damage over time.
BMW recommends the correct grade to use for your specific vehicle in the gas door and the owner's manual. I, and am sure, other 'Werkz experts will join me in recommending that you stick with that is specified.
I don't think he's talking about running soley on Ethanol, but on the federally mandated 10% blend. Even though some vehicles can run on E85, I know BMWs won't.
I asked my BMW mechanic a while back and he said US engines are all designed to run on 10%, but from experience you'll get significantly better mileage on pure gas.
Unfortunately here in Minnesota we don't have anything BUT the 10% blends unless you want to look for some very expensive pure fuel. Even that's only allowed in small gas engines (although no one complains if you put it in your car). I've never had ANY issues in my BMrs running on the fuel here again except in the cold weather and the mechanic says it might be water in the fuel.
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