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He's in the wrong forum. For 2012, they went to a different engine that used direct injection. I think it's a 60 degree block instead of the 90 in the 272. Anyway for whatever reason, you have to take the intake manifold off in order to change the plugs so it's a lot more complex than the 272 engine. For the 272 engine, they're rather simple, I think mine were done in less than 20 minutes. That engine also went to a multispark system that fires up to 4 times per cycle so that 60k interval is also right.
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.
