i guess what am i asking is that for those who have used 87 in your bmw engines, is there any negative effects besides lower power output.
my family is not looking to have this car for another 20 years, so keeping the engine running for that long is not the top priority.
it is just impossible to find 93 gas around atlanta these days...and the X5 4.4 gets like 14 mpg around town
i had a friend in college who would regularly use 87 and would fill up with 93 every 5th tank with his G35; and that is on a pretty high performance V6.