For those of you considering this compressor, in the manual it states it does use hydraulic fluid number 46.
I recently bought a Tuxing comp from aliexpress and I'm using Chemlube 751 as it's designed for reciprocating piston HPA compressors. I'm also using water and a "water wetter" in my cooling bucket. I haven't been able to test it too much yet. My tank comes tomorrow and my moisture indicator comes Friday.
If the manufacturer recommends a certain type oil and you choose not to use it wouldn't that affect any kind of warranty?
If the manufacturer knows anything about standards he or she will give you the minimum requirements for the lubrication needed. Marko