So am I correct in thinking it is too cold?

It is Mercedes grey. Course, that's one of the things that needs some attention. It is quite faded.

Any sources for a repair manual/CD. I checked Alldata and they only go back to '82 I think. eBay didn't have anything. I've heard the Haynes manuals are good. Do you still have the manual for the 78 450SEL you sold???