His approach is the proper one. I am new at this, and (with the help of reading this forum) have been able to guess right on some items. I've guessed wrong some too, and own some good used parts as a result.
Larry--is there any way to check the valve guides themselves before removing the seals? Or is that only going to be discovered in the midst of seal changing?
btw--the oil fill cap seal ring can be replaced for a buck or so, instead of the whole cap.

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Earl McLain
'02 C230 Kompressor
'89 560 SEL "Frau BlueCar" (retired April 2004)