I bought a used PM20 industrial planer awhile back. I asked the guy a question about changing the oil and the answer was that he never did. That got logged in my lil brain as a to-do. Thing is, I could never locate the manual for the planer online. A very similar looking Jet was all I could find and it stood to reason that the Jet replaced the now discontinued PM20 when WHM brought the two together. They are actually quite different under the shrouds.
Anyway, some personal distractions kept me from that part of my brain with the to-dos for a year (and the shop, too, so no additional hours on the planer). I got to it last weekend.
(okay, how many of you went: "oil? my planer has oil?!")