For my new silverado 87 octane or 89 that is the question and why?
S smokerace · Registered Joined Mar 23, 2011 · 6 Posts Discussion Starter · #1 · Apr 26, 2011 Only show this user For my new silverado 87 octane or 89 that is the question and why?
silveradotrailblazer · Registered Joined Dec 24, 2008 · 7,291 Posts #2 · Apr 26, 2011 Only show this user It's made to run on 87, unless you have a performance tune than save your money and run 87.
