Well Guys, all of you have a snap shot of the refrigerant issue correct. My Dad and I just did the a/c system in my 300SDL:
-both drier switches
-Freeze 12 refrigerant.
I'll tell you from first hand experience, this stuff blows better than any R134a vehicle that has retrofitted from R12. It's the best of both worlds. As long as you have esther oil in your compressor and system, you can use this stuff. I used 3-12 oz. cans for my system.
Compared to R-12, my money's on this Freeze 12 stuff. I paid around $8.00 with tax for a can.
99 C230K Sport