Thanks to all who have replied. I have not done the spark plugs yet for 3 reasons. Car runs perfect and I want to do this as PM when I have the time and right tools. I now have the Snap On spark plug tool so need the time. #2 Just bought a very nice 1987 190E 2.6 and doing the cam seal, timing cover leak, complete tune up and replace radiator. And, see ML list for oil comsumption problem being taken care of by great dealer. Will report spark plug change and what contorsions are needed with in a month.