Thank you Csnow
I hope that the mineral oil have some kind of compatibility with the previous oil used in my system, because I was told that the compressor can not be flushed, only drained and I wonder how many days I have to leave it hanging to drain all the remaining oil. Thank you for the answer, I am planning to do a full flush of everything I can flush. There is a hose with a muffler or something that I can't, but the other hoses, the evaporator and the condenser will be flushed. Thank you again.