Peanut, i assume the lease is with MB financial
If so as long as the service indicator is not showing on the dash you will not be charged anything. As for the plugs i don't think they need replacing until 160k.. It is expensive though as there are i think that engine had 2 plugs per cylinder and they are a pain to chnage.
Tranny fluid is reccommended but i don't think you will have any issues if you don't do it.
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