What an idiot advices ..... ??? ( is no DIESEL .... )
There is not written, that that car won't start, but has not been started for 15 years.
Now he is trying to get that car ready for running and they want to prevent for future damages ....
THAT is all I can read in his posting.
Wait, you have 18 posts and you have this to say for YOUR response? There's no need to get snippy Paul. We can leave that to our children.
And Paul, do I read your post correctly in feeling you think smog controls are only on diesels?
If you keep the car, I second the notion of pulling the smog stuff off (wouldn't work in Colorado, as the air pollution Nazis would break down the door) and putting it all in a box for whomever you sell it to down the road. Some folks are rather particular about originality, especially regarding a 600.
If the intent is to see if the old beast can be resurrected in preps for a short sale in the near future, I'd get all the major mechanicals working, test the engine to see if it at least spins, replace that schraeder valve to test the suspension, and make a decision as to how best to advertise the thing.
If the intent is to keep and restore the car (and take note as this is the one time you'll ever hear ME say this), do it up right and go "full Mercedes." If you start replacing things with aftermarket or "not original" parts, the worth of the car will drop. I wouldn't say this about a 108 or 109
Good luck with the car, and I'd love to see pics too.