Dear Friends,
Please do not get your car AC serviced (desi style) if its working all right.
Guys, AC systems are assembled in dust free envoirment and dust is killer for compressor. The way AC compressor, pipes and condenser are handled by "Ustad's" the system will surely die.
Just change the cabin filter, clean condenser with compressed air and evaporator washed every time you get your car serviced. Oil is only needed if it leaks.
I have 2003 Vitz, bought in 2006 for the past many years I have never had any problem.