Which A/C oil? 2000 W900

Usually PAG 100 in York/T CCI compressors.

 

Always always always use the oil that is recommended for the compressor. The rest of the system doesn't care about what type of oil.

 

While we are on the subject please allow me to through in some questions and provide some information to the best of my understanding. My first A/C certification was around 1985 and sometimes I need some updating.
When R134 came into play retro fit kits came on the market and everyone used them. The oil provided in those kits was labeled for use in all systems. Also compatible with small amounts of any other residual oil. I skipped the kits and have used that type synthetic oil every since by the quart. Last time I ordered it I was told they do not carry that anymore. Ended up with PAG 100, not synthetic.
I worked on a small bus with three evaporators and two compressors. It had a tag for a GM oil on one system and a Ford oil in the other. I know but it was on the tag with the spec for the oil?
Put a reman compressor on my JD 4240 last year. It says use only 525 mineral oil. Is there such a thing as a universal refrigerate oil?
I see Heavyd has answered my question before I asked but I will finish anyway. It may help someone else or I may get some more good information.
Piston compressors, Yoke and Tecumseh, has a plug in the side of them. They hold a good bit of oil and should have about an 1 5/8 of oil in the bottom of them. They can be dipsticked by taking a tye strap and putting a small bend in it about every inch making it into a long C. It maybe necessary to turn the crankshaft for clearance. I usually do not add oil to them but check it.
If you replace a rotary compressor there is no way to know how much oil is in the system unless you empty it. Flush the entire system. Take that new or reman compressor and stand it up so you can rotate the crank and drain all the oil out of it. I have found them everywhere from a complete oil charge to none. Then add the correct amount.

 

Yep that's it.