Yep. What VSTECH said. Don't even mess with it- Put in whatever the OE spec stuff is (probably mineral oil) and use enviro-safe stuff charged to the factory spec (should be around 30 PSI at 1500 RPM or so)

Enviro-safe works like a champ-, and doesn't react to moisture like the other stuff does. I use it in my 89 Silverado (goes below 42 degrees) and my 96 C36 (which will hold 46 degrees at the vents with 100 degrees outside) and the W123 will get it next week.

Not to mention it's the cheapest refrigerant out of the three.

rjp

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03 540I (GAK!!)
81 280E (W123)
70 LeMans Sport with pissed off Poncho 462"
1989 Silverado Step Side (under the knife- complete restomod)