A word on rust treatments and floor pan rust out as was mentioned above.....

I have gone through a lot of early 70 Mercedes. Everything from a 220d to a 6.3. I began to notice a pattern.........

Those with rusted floor pans were always undercoated. Now I remember shopping for a Mercedes in the early 70s and undercoating was a dealer add on. It was pitched as a way to make the car quitter. And it did.

But years later it could crack, catch water, and rust out the floors. But then, who would expect a car to last fifty years? And still be a daily*driver.

I have not seen this on a early 70s Mercedes in a long time. I guess they all just rusted out.

By the way..... Porsche's also suffered from this same problem. I think in 1980 Porsche went to hardcore rust proofing due to a bad reputation in this area.