I run the ES stuff in my 190E. I was getting high 30's at my center vent. I'm pretty pleased with its performance.

I've got R12 in my 420SEL and it only gets maybe into the low 50's on a good day.

I gave it a try on the 190E because I knew I had a small leak that would eventually empty the system as it had in the past. It was getting rather hot in the summer and I figured what the hell, its pretty cheap.

I'd already paid for R12 once when I first got the car and again when they put a dye in to find the leak. The leak was never found so its possible that its more near the evaporator.

I threw the ES stuff in and its still holding a charge a year later and running nice and cold...

You'll hear a lot of people speak against stuff like ES-12 because its a butane/propane/isobutane type fluid and as such is flamable. However I don't think its flashpoint is much different than R134A.

Freeze-12 is another commonly used refrigerant. I tried this as well, its cooling performance was poor compared to the ES-12 stuff. F-12 is 134A based.

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82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k

I had success with Envirosafe in a W124 with a weak compressor. It would barely cool with r134 and with ES it work well enough that I never replaced the compressor.

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1997 E300 Diesel - 222K miles

I put it in a 126 that has R-12 in it. That was 2 years ago and it has been marvelous ever since. I still have about 9 bottles left. I even put a can in a 124 Diesel I had and it worked perfectly.