84W123DT,

24,000 KM may be appropriate for new engines but for older engines with more miles on them. I have found that every 25,000 miles is sufficient.

I say this because once I was going to adjust the valves of my 300SD after 25,000 miles and NONE of them needed adjustment. They were all with in specificaion. Always check the clearance before loosening anything. You may find that your valves are similar and don't need adjustment or only a couple of valves need adjustment.

You don't need the special wrenches either. I get along fine with 2 open end wrenches.

Most important part of the job is to get the lock nuts on the valves very tight. I destroyed one MB engine because the lock nut (adjustment done by someone else) came loose.

P E H