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Thanks for the WM link. My 550 is from 2014. It still works 100% for now. A little monster. I have heard some things I don't like, one of which is crank bearing failure on the chain side. I'm sure that plastic bearing will fail when I need it most. I will look at the WM to start a list of parts & special tools needed for the job.
I can go months without using the saw and then saw for days at a time. Hurricane Michael got me disgusted. Enough down trees for the next 200 years. I gave up.
The oiler is set so you should run out of fuel before chain oil. Your chain is dull and/or the oiler is clogged. I run full chisel chain on oak and I touch it up after each tank of gas. Should throw chips not powder.