POE oil breaking down and forming "wax", and plugging up driers and cap tubes is fairly common on small systems. As noted its usually caused by running for a long time with a dirty condenser or non-functioning condenser fan motor, which overheats the oil and turns it into wax.
You should see what some of that cooked oil looks like, kind of dark with small chunks in it. After you drain it, you can tell why the cap tube and drier keep plugging.
If its really bad we will pull the compressor, drain the oil, and refill the compressor with new oil. Also flush out the system as best we can with nitrogen and maybe some rx-11.
For driers on cap tube systems, I like the Sporlan C052CAP-TT-HH
Its amazing how much money people will spend to repair, instead of replace. Its like they have it in there head - they look at a 10 year old reach-in, and say "theres no need to buy a new one, this things only a couple years old"
I had one small system I worked on for literally six hours. I put a new cap tube in, drained oil in compressor and refilled, then I actually took the condenser out and blew rx-11 in it and shook it, turned it upside down and drained all this black sh** out.