ML 320 Tune Up

[Ramrod]

I have a '98 MB ML320, purchased new, has 94k miles. All maintenance thru approx. 70k miles was performed by Mercedes dealer where vehicle was purchased. I have done all mx. since, primarily oil and filter changes and new brake pads front and rear. Getting close to 100k mile I want to change the plugs. I need guidance on how to get the plug wires off the plugs . I know this sounds stupid but there in a metal sleeve around the plug wire where it attaches to the plug and it baffles me how to get it off so I can remove the plug/s. Another concern arose as I was reading a forum about ml tune ups, is the fact that my plugs may be frozen as they were not changed on or about 4 years after purchase. In checking the mx schedule for the vehicle the plugs should have been changed by the dealer when vehicle was in for a B type maintenance 4 years after purchase. Checking my maintenance file this was not done, nor was I aware it should have been done because of the dealer claim that vechicle did not need a plug change until reaching approx. 100k miles. At any rate the vehicle is almost 8 years old and it is due for a plug change. Vehicle is running fine, no complaints there and gas mileage is according to specs, 19 city, 21/23 highway. So bottom line I want to try a plug change myself, just need some help on a procedure. If I cant remove the plugs because they are frozen it will be off to the dealer. Maybe they will acknowledge that they should have been changed at the 4 year B mx. and give me a break. Yeah, right. Looking for all the help I can get from you Benz Mechs. out there. Thanks, thanks, thanks.