why on earth would MB let the dealer sell keys that aren't suitable for the EIS? that sounds like a nightmare to try communicating it back up the foodchain to Stuttgart
I am happy using the old key and I'll put the new one away and just say its for emergency purposes, ha! I sure don't plan on making it a throwaway . . .

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'95 E320 Wagon my favorite road car. '99 E300D wolf in sheeps body, '87 300D Sportline suspension, '79 300TD w/ 617.952 engine at 367,750 and counting!