油分对空压机能效影响主要是油分压差，油分两方面的压差会影响空压机能效：
The main influence of oil on the energy efficiency of air compressor is the pressure difference of oil
一、初始压差。通常来说，不同厂家、不同做法的油分，初始压差一般都不会相差太大，一般相差0.1～0.2公斤。因此，不同厂家、不同做法的油分，各自对能效影响的差别也不会特别的大。当然，如果采用初始压差越低的油分，能效会稍微高一些。
1、 Initial pressure difference. Generally speaking, the initial pressure difference of oil from different manufacturers and different methods is generally not too large, generally 0.1-0.2kg. Therefore, different manufacturers and different practices of oil content will not have a great difference in their impact on energy efficiency. Of course, the lower the initial pressure difference, the higher the energy efficiency.
二、油分中、后期压差。如果油分中、后期压差较低，会大大提高空压机能效；反之，如果油分中、后期压差较大，会大大降低空压机能效。油分中后期压差较大，一般由四方面造成：1.空滤过滤精度太低，被吸入灰尘过多；2.润滑油品质太差，产生积碳过多；3.空气潮湿或者运行温度过低等，导致系统水分过多；4.油分自身设计、制造原因。有少数油分厂家为了迎合空压机代理商，单纯追求含油量低，导致油分中、后期容易内压高。
2、 The pressure difference between the middle and later stage of oil separation. If the pressure difference between the middle and later stages of oil is low, the energy efficiency of the air compressor will be greatly improved; on the contrary, if the pressure difference between the middle and later stages of oil is large, the energy efficiency of the air compressor will be greatly reduced. The large pressure difference in the middle and later stages of oil separation is generally caused by four factors: 1. The air filter has too low filtration accuracy and too much dust is inhaled; 2. The quality of lubricating oil is too poor and too much carbon is accumulated; 3. The air is humid or the operating temperature is too low, which leads to too much water in the system; 4. The design and manufacture of oil separation. In order to cater to air compressor agents, a few oil manufacturers simply pursue low oil content, which leads to high internal pressure in the middle and later stage of oil content.