Why’s one better than the other? Also, my car 2016 328i x drive was given to me at 61,000 miles. Is there anything I can buy to put in my gas tank with the gas once in a while just to clean out the gas lines? I know they sell stuff like that why or why should I use it? If I should which brand is best? Thanks in advance everyone!
89 isn’t premium. 91 or 93
My 540i says 89 is required, and what is available may depend on where OP is. If he’s in Denver, Premium is probably 89 or 90 because the elevation means higher octane isn’t as necessary.