I have been running these in my 200es, and 250es, anyone recommend anything otherwise? just looking for less fouling, I believe one of my 200es valve stem seal seals is leaking a little. I change plugs every 3 hours!!! Just looking for an upgrade if there is one? I see that the NGK has a heat range of 8, and the denso has one of 24, not sure what that means. what about iridium????
Thanks


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