Thanks for posting that. Admittedly the C43 is a fairly rare machine, and I've only seen them at the new auto shows (and even that's been awhile). Sounds like the engine trim is more along the lines of the V8's used say in the S Class, I was thinking more like the ML.

GLAD you got the correct plugs at half-price, that's what I call win-win. They don't change recommendations on sparkplugs just on a whim, must be a valid reason somewhere.

Gilly