Quote:
Originally Posted by Bertram28
So here is my bottom line: I have used Shell premium since acquiring a used E34 M5 with 165,000 miles on it in 2006. Some 13 years later, that car is one short trip from 229,000 miles. I regularly shift near its redline; and, cruise in a 3,000 to 3,500 rpm range all the time. Never had an engine issue.
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Ive used any brand name premium octane in my M5s, an E28 M5 with 20 years of ownership and 200k miles on my watch and an E34 M5 with 17 years of ownership that is now rounding the bend towards 190k miles on my wifes watch. Never had an engine issue, even with consistent high rpm shifts as you know is necessary with the S38. Of course cruising is going to be 3000+ rpm, M5s from the E28 and E34 generation are geared in this manner.
I use Kroger fuel consistently bc of fuel points and the AAFES/NEX military fuel stations. As
AnOldBiker states, it is likely the shell fuel you are using is sourced from the same depot as other brands; if not, then the BP across the way is likely using Shell refined fuel. Keep using Shell, but in many cases it is the same source with different additives/detergents. Im much more picky about other matters relating of the care of my M5s than fuel brand.