I didn't realize there were SDL's made before 86. At least legally made / imported for / to the US.
I will check the radiator cap, though I'm sure my mechanic already has. I would readily reccomend him to anyone on this list or otherwise. Works only on Mercedes, and has even in the past replaced a part that failed prematurely [no warranty]. They only work on Mercedes, and have always been fair / honest. $50 - hr.
$5200.00. That's nearing the point where you have to start considering what the car is really worth to you... I will search using your name [Lance] and see what I come up with.