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· The Nuclear Option
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5,997 Posts
I'm watching this conversation so it doesn't get out of hand. ;)

If you want to run 87, here is what you can do. If the car isn't stock, return it to stock condition. Clean the induction system and fuel system well. Change the spark plugs Stop monitoring your PIDS and forget everything you know about mechanics.

Then you can drive worry free on 87 just like GM recommends in the owner's manual.

Otherwise pay a little more and use premium gasoline. You'll thank yourself.
 

· The Nuclear Option
Joined
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5,997 Posts
OE plugs are the best but might benefit from a slightly tighter gap.
Why would you use 'ruthenium' when the GM spec calls for Iridium ?
Ruthenium plugs weren't in existence, at least readily, in the 2011 - 2016 time frame. Therefore GM couldn't recommend them.

That being said when my car was stock I tried Ruthenium spark plug and couldn't tell any kind of a difference vs. Iridium plugs.
 
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