I've always used Shell premium with no additives. Original pre-cat O2 sensors lasted 260,000 miles and I didn't have to replace the catalytic converters until 379,000 miles. Never had any injector problems.


I do use the Sta-bil treatment in every tank of fuel (Shell mid-grade) in my personal watercraft though. I paid the price of a new short block from ethanol damage in the two-stroke PWC I had earlier. At least the current one is a four-stroke and can't suffer the same level of destruction.

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2016 F15 x35i
2014 F32 428i


2004 E46 325i sold at 123,600 miles
2002 E53 3.0 sold at 388,801 miles
2001 E46 325i sold at 66,000 miles


1970 Firebird Under restoration