Damnit Alon! I am so jealous of you Benz drivers whose cars seem to be able to maintain a decent temperature. I drove a 300E today. The outside temp was about 83, the A/C was running, and I drove it up a steady incline at about 85 mph. The temp gauge held at 90 C. My 300D has a brand new radiator that is filled with 50/50 MB coolant and today it hit just over the 100 C mark while cruising about 80 up an ever so slight incline. And it's a diesel!!!! Diesels don't usually get very hot. I am so damn irritated. I have no idea what is wrong with it. I am going to post a thread about it right now.
Anyways, glad to hear your car is running good. BTW, I looked at your website (again), and I just can't get over how good the DOHC 3.0 engine looks. It is pure German artwork.
1976 300D (W115) - 330K and still going (sort of)
1991 300D 2.5 Turbo - Sold at 221K
1983 280SEL - Sold at 206K
1981 300SD - Sold at 232K