Things to check:
oil tank vent,
oil filter,
oil pump worm gear,
passage through the oil port and bar to the chain,
and of course make sure the output adjustment screw is turned up high enough.
I have a cheap Kobalt saw that I tend to forget to put oil in because one tank lasts 4 batteries, and by then I've broke the habit of refilling it. On the bright side, I have 4 battery changes to remember to top it off.
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