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A friend has a 1999 300M with the 3.5 V-6, shows 112K on the clock. He decided to make a social event of repairing the A/C so came over to th' hovel Saturday AM. Found a "pinched" O-ring at the recently replaced expansion valve and put in a new drier... We stretched a one hour job out to two, vacuumed the system down for another. Then went out to find a set of plugs for it (and a CAB run). A/C worked well, plugs were ~original~!! He had replaced the cam belt a few months back but didn't pull the plugs!?! Anyway: the plugs had widened themselves to .075" over the time but the engine STILL ran well! I'm surprised & impressed.