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!
Look at your manual’s gas requirements page. It most likely says that 91 is highly recommended but using 87 will not result in engine damage. I have found that Costco gasoline, in personal testing of my cars of all types, has caused noticeable benefits in operation. As an additive, Chevron Techron has been proven to work, if you are adding it to other brand fuels. I don’t use additives with Costco gasoline. Costco has a proprietary blend produced for them by a variety of major fuel distributors. It’s “Top Tier” gasoline.