Current regulations relating to A2L fluids

A2L fluids available on the market

Using A2L refrigerants

I diluted the anti-freeze myself and the freezing point is measured as -17C when it should be -20C

Glycolated water, whether prepared by me or delivered ready to use, used to protect down to -22C a year ago, but it is now only -18C

My secondary cooling installation is malfunctioning, after a few hours the yield drops

For what stands the abbreviation VG in an oil name ? E.g. VG 68

In an installation, can we mix oils of the same type but with a different ISO grade ?

Is Nettogaz GC1 toxic ?

Is Nettogaz GC1, environmentally friendly?

Can I clean the compressor with Nettogaz GC+ ?