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      03-21-2018, 03:50 PM   #5
Private First Class

Drives: 2018 G30 540i x drive
Join Date: Jan 2018
Location: Devon, UK

iTrader: (0)

I would completely agree with AP as well... I have used 95 and 97/8 in previous petrol cars (ford focus RS) and can't say that higher octane makes any noticeable difference at all. I spoke to the dealer about this for my 540 and he said the same - unlikely to be anything tangible in it. What I plan to do is run a couple of tanks of high octane through it every now and then though as I have heard that there are some better cleaning additives in the higher octane fuel, for the most part though I will stick with 95.