Yong Heng Chinese 4500psi Compressor Lubrication/Maintenance.

[AirgunGuy2018]

What lube should be used on the Piston o-rings? i just want to make sure i use the correct lube that wont cause the compressor to blow up when pressurized. also id like to know what size o-rings should be used on the Yong Heng Compressor piston, please refer to the picture below, if anyone has the direct part links from aliexpress i would appreciate it thanks, also look at the condition the piston head is in after only 2 hours run time, i need new o'rings for it, also id like to know how long should i run the machine before letting it cool down to avoid the rapid deterioration of the piston head like in the picture below.

[Qdoggus]

I use Sinopec AW 46 Hydraulic oil. Works fine, no explosions,  it it does turn black after 3 or so uses. As for the Oring size, you could try to measure the outer diameter of the shaft in the rough groove, that would give you an ID to search for. First teardown, I'm putting  Viton  (milspec) o-rings in. I've had nothing but long lasting success from Viton.

[JPowell490]

This is what I am going to use, as soon as my compressor gets here.

[AirgunGuy2018]

This is what I am going to use, as soon as my compressor gets here.

good quality oil.