1. 能避免冷凍油劣化，或干化，造成壓縮機潤滑不良的問題。可延長壓縮機的壽命。
2. 壓縮機潤滑良好，可降低冷氣管路高壓側壓力1~3kg/c㎡以上。一旦高壓側壓力下降，低壓側壓力也會下降。这可使到冷房效果提升與壓縮機運轉負荷變小 (開冷氣时加速變輕快，引擎震動降低)的直接好處。另外，高壓側壓力下降，壓縮機、高壓軟管、高壓鋁管、冷凝器、壓力開關等高壓側冷氣管路零件的耐用度也會跟 著間接提升。
3. 随着壓縮機潤滑良好，冷氣管路高壓側壓力降低，怠速時壓縮機運轉或停止時，怠速提速器的提速幅度降低，引擎的穩定度會提昇。
4. 如果冷凝器在引擎水箱前，高壓側壓力下降，溫度也會下降，有裝3環錶的車主，可以發現水溫跟機油溫度也跟著降低。
5. 如果冷凍油管理不精確、補充新的冷凍油品質不佳、抽真空及冷媒充填程序不確實，冷氣不冷與不耐用、異音(潤滑不良、有空氣與水份等)的問題反而會接踵而至，慎選店家是非常重要的事。
Benefit refilling Compressor Oil:
1. Refilling Compressor Oil once in a while can prevent the quality of the old compressor oil inside the compressor from degrading, or drying because of high temperature in the compressor. If the compressor oil has degrading or drying, it will cause the poor lubrication to the compressor piston. If the car user has refilled the compressor oil once in a two years, this can prolong the life of the compressor.
2. With the good lubrication in the compressor piston, it can lower the AC high pressure side's pressure to more than 1~3kg/c㎡. Due to that, the low pressure side's pressure will decrease as well. Thus, the air temperature inside the car will be lowered down more faster (become cooler) and ease the working of the compressor piston (easier to accelerate when AC is on, car engine less vibration while the AC is on but without driving). This lead to the better stability of the car engine.
3. Furthermore, once the high pressure side's pressure has lowered down, it can definitely prolong the life of the compressor/pump, AC piping no matter is rubber or aluminum made, condenser and all other parts on the AC system's high pressure side.
4. If the condenser is installed in front of the car water tank, the high pressure side's pressure decrease, the engine temperature will decrease also (can be seen from the engine temperature meter in the car).
5. If the Compressor Oil refilled has a low quality or the mechanic did not vacuum the AC system and insufficient gas is pump back to the system after refilling the oil will cause the AC condition more worst than before. The AC will be not cold as before or the compressor has annoying sound and other parts in the AC system such as piping would burst easily are some negative effects. Hence, it is very important to choose a good service center for your car AC.
