I have my '97 E320 in for the 90K Maintenance - the indie shop told me that spark plugs are not art of the scheduled maintenance. He said the plugs are supposed to last 100K but he's seen them go bad at @ 90K.

Is this for real? On my '86 300E plugs and wires were part of every 30K maintenance. any thoughts?

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'97 E320 Black Opal
'86 300E Smoke Silver / Burgundy (retired at 198K)
'63 Austin Healey 3000 Mk II (BJ7) (reluctantly retired)