I'm very happy with Envirosafe and it is Legal as long as you replace all your seals and put on the R134A fittings, Envirosafe charges the same way. There is a lot of panic about Envirosafe being explosive, but almost all of it is pure bull. Sure it will explode if you do stupid stuff with it and R134A is twice as likely to not only explode, but more violently and poisonous gas causing permanent brain damage and death results. Even R 12 would turn into phosgene gas, a deadly and toxic gas that kills without warning. Envirosafe does none of those things and if you use standard safety precautions, you will be fine!

Envirosafe is compatible with oil from R134A or R12. Since you have to take your system apart anyway to retrofit, just use compressed air to blow the excess oils out of your system. R12 oil is still easy to get and in my opinion, it makes for a better lubricant. Envirosafe charges with the can upside down and goes in your system in a liquid form. Diesel engines do not have fuel anywhere near as flammable like gasoline or electrics for ignition. A good quality guage set is necessary since sight glass readings are meaningless here. Since it requires about 1/2 the energy to make it cool, a parallel condensor isn't necessary. Your fuel economy will be much better and your system will see a longer service life!