We had just the seals replaced on this one, to little effect. The guy who did the seals said the valves looked fine, but my local MB guy is saying you need the whole shebang for it to work. Mind you, this car only has 84K! The seals made sense because they get old and brittle, etc., but it just doesn't make sense that the guides and stems would be bad???
1980 450SL 90K
1980 300SD 112K