I have recently purchased a E320 , 1998 with 100,000 miles on it. I want to do an initial maintenance routine as a base line. I have changed the crankcase oil and used mobil synthetic, I attempted to change the spark plugs but after the first one, the wires are extremely difficult to remove, is there a special spark plug wire removal tool? Also, I want to replace the trans oil with Mobil synthetic trans lube, but the local dealer said only Mercedes oil can be used, is this so?

Regards,
Ray