Every four years I need re-gas my replacement York compressor to maintain adequate cooling. Both gas and oil have slowly leaked out (underneath compressor wet with oil) but I am concerned that eventually the sump oil level will get too low and the compressor seize. At my last re-gas up I asked the aircon guy to unscrew the sump oil fill plug in the side of the compressor and use a flexible wire dipstick to check oil level before regassing. He just said he didn't want to do that, but then said he will put one once of oil in the system via the suction line, but this does not fill the sump. Also he put the new drier in back-to-front which does not give me confidence. My York compressor is 8 years old and gives ice cold air when its regassed, and then good cooling for 4 years. Its time to regas next week.

If aircon guys wont do this job, I am prepared to let the remaining gas out, pull the fill plug, check oil level or suck it all out to check volume, and fill with oil (if someone can tell me the amount - onces, or cc (cubic centimeters), or oil level depth (1 inch??), then get an aircon guy to just regas.