I would not use old motor oil especially if the manual says for your to not use it. Aside from voiding your warranty, I would think that "poor boying" the saw would invite oiler and mechanical trouble with the bar and chain in the long run. It is not worth the risk to me.
As a thought exercise, are oilers and chainsaws more advanced and better than years gone by? If so, I would heed their advice like I heed the advice of my dealer to buy certain types of oil and avoid others for my truck. (I change my oil, but buy synthetics--within their recommendations. Royal Purple, Mobil, and so on.) Trucks today are more sound mechanically than in the 1970s or 80s and should last twice as long a pickup we bought in the 1970s or early 80s. Granted, we can't work on them, but I will take that trade off. My two cents give free of charge.
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Today's Featured Article - Fire in the Field A hay fire is no laughing matter-well, maybe one was! And a good life-lesson, too. Following World War II many farm boys returned home both older and wiser. One such man was my employer the summer I was sixteen. He was a farmer by birth and a farmer by choice, and like many returning soldiers, he was our silent hero: without medals or decorations, but with a certain ability to survive. It was on his farm that I learned to use the combination hand clutch and brake on a John D
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