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      05-19-2013, 12:24 AM   #74

Drives: 2008 E92 M3 M-DCT & 2017 440GC
Join Date: Dec 2006
Location: Mission Viejo, CA

iTrader: (0)

Originally Posted by OilPatch View Post
This thread is just packed with info I love it. I don't have my car yet, but I'd like to give it the proper treatment from day one. My main concern is in my city (and any city within a 200mi radius) the highest octane you can buy is 91. I was planning on adding an octane booster with my fuel to help this, but I don't know if there is a brand out there that anybody has used to prevent carbon build up on the spark plugs?
Save your money, each spark plug is used to monitor spark knock. If you live in "the city" you won't have your foot in it for very long.
If you will be dyno testing or playing at the track then you might find a need for higher octane.