HD77M ski saw rebuild I bought and this oil is for the same. I've read that any gear oil will work, even Slick 50, but the saw is old and I didn't want to risk it. I drove for a few minutes and drained the old oil. The procedure says to use kerosene for flushing, but I'm trying to avoid using combustible materials in the basement repair area, so I used a Lucas fuel system treatment. Oil-based, odorless, non-flammable and with good cleaning properties. I flooded it with Lucas treatment, walked 2 minutes. Then I drained it and put new oil in. The saw works perfectly and cuts the same way.
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