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One other observation.. on the first change, i changed out the "E7S" with the "H7S"
NGK's website says the E is superceded by the H, once stock is used up of the E to use the H.
The spark plug reach is increased, as well as the resistance in the new plug design likely to help with combustion, reduce risk of LSPI maybe? ie piston cracking. Curious what plugs were in the cracked piston cars.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.
