Yeah compressor can last over 10 years without changing the oil if u lucky. Then just change everythg for 2k when the time comes.

Or u can spend rm150 every 2 years like i do. Penang island got two shops i go to not bad.
One is a small shop right behind DRG motorsport, need use back road a bit and tight road. A lot customers but they dont cheat u.

Another is Chiew auto aircond service near golden triangle. I top up gas and also flush my aircond oil here. A bit pricier but good. If electrical issue he will sub to other shop and u prepare to get your head chopped.

Flush and change compressor oil using machine. Topup the dirt will still be there.. and usually it wont reduce unless got leaks

Beng lee exhaust ah. Corner lot shop i think? Do all sorts of things one including air cond. I only go to them doing small stuff like bulb blow etc.

Ya after flush must refill again so he no tipu