[Eric1992]

Hello, was stupid enough to accidentally fill 87 into my bmw330i, about 2/3 of tank, thanks to Chevron's reverse ordering of fuel classes at their stations as well as my muscle memory... Unfortunately we only have 91 in California, so had to find a local VP racing fuel dealer to add 5 gallons of VP MS 100.
Now kinda concerned if this is the right thing to do. Should I worry about ethanol levels or something like that? MS 100 has 10% ethanol, which I guess should be OK?

[SlowE92]

Originally Posted by Eric1992

Hello, was stupid enough to accidentally fill 87 into my bmw330i, about 2/3 of tank, thanks to Chevron's reverse ordering of fuel classes at their stations as well as my muscle memory... Unfortunately we only have 91 in California, so had to find a local VP racing fuel dealer to add 5 gallons of VP MS 100.
Now kinda concerned if this is the right thing to do. Should I worry about ethanol levels or something like that? MS 100 has 10% ethanol, which I guess should be OK?

You would have been perfectly fine with the 87 in your tank. 2/3 of a tank once in a blue moon won't hurt anything. And no, you'll be fine with the 100 octane in your tank.

[Eric1992]

Originally Posted by MakoB96

You would have been perfectly fine with the 87 in your tank. 2/3 of a tank once in a blue moon won't hurt anything. And no, you'll be fine with the 100 octane in your tank.

Much appreciated!

[oVeRdOsE.]

87 on a 330 is not an issue, tons of people run 87 because cheap, and the knock sensor adjust the timing accordingly.

worst case it will be limp mode until stop knocking and reset.