[jdmccright]

I'm not familiar with what is the common refrigerant used in new vehicles over there. In the U.S., R-134a is what is used. It is a pure gas, tetrafluoroethane. Because it is pure, it is currently recyclable by professional shops and because it does not harm the ozone (so they say), can be handled by the average guy as well. However, shops use equipment that can remove and store it on site, to keep it from entering the atmosphere.

All of the refrigerants you mention, R-409, R-413, R-437, etc., are actually blends of different pure gases to try to mimic the performance of an old refrigerant without causing as much damage to the ozone should it be released. Using one of those would require someone experienced in handling that refrigerant in particular.

As mentioned, there are many R-134a retrofit kits available in the U.S., but please let us know what is used over there.

My recommendation would be to convert over to what is used in new vehicles over there, which should be the R-134a. The big reason being is that should your car's A/C ever need service, the refrigerant can be recovered without requiring the shop to dispose of it as a hazardous substance, which can be costly. Using the -409, -413, or -437, you would be beholden to that shop to do all your future work.

Hope this helps!