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We have the same engines as the 135 and 335, so I spent a ton of time seeing what the highest performance guys do. The recommendation is to change every 10-15k if you are running a heavy e85 blend and a lot of boost, and you're exactly right - I use NGK 5992 plugs which are one heat range colder. I actually got rid of the stock plugs at 3k to switch over.
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