Have changed the plugs a number of times since 2011 always used NGK and maybe once champion. I could not find NGK close to home so xrefed and settled on Autolite. I was very surprised at the outcome.
Joe- You might also consider not overdosing on gasoline additives. More is not always better. Startron is reportedly "gasoline-based" but the product is not the same as the fuel on which the engine is designed to run best. When used , suggest you follow label directions.
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