Oil for Chainsaw question

No, bar and chain oil is really heavy oil

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Can I use old motor oil from when I change my oil in the truck for the lubricant for the bar?

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Assuming you collect and store it in some kind of decent way, yes. Dont just drain it from some old dirty arse bucket into a dirty arse jar and start pouring it in stuff. You need to keep it clean. You should be doing this with your old motor oil anyway, it has lots of uses.

Bar oil isn't a waste of money. Its much thicker and tackier than motor oil, and its biodegradable. It works better for the bar and chain but unless you're running a saw hard and often you'll probably never notice. Used motor oil is messy. You may have to adjust your oiler since motor oil flows much easier.

ive always used motor oil

Because used motor oil is basically free, and works fine.

Also useful for weatherproofing lumber on trailer decks.

Messy as hell and it will sling the hell out of it

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You should be doing this with your old motor oil anyway, it has lots of uses.

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Like what? I know about staining wood with it, but what else?

Jeeze, bar and chain oil is $4 for a lifetime supply for the average homeowner.

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I know they make a chainsaw “blend”. Wondering if this is a waste of money or not

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Bar and chain oil is designed to stick, motor oil just slings off and makes a mess especially as the bar and chain heat up. I bought a jug of Stihl oil and it's lasted years. Chainsaw oil pumps are prone to leaks anyway, don't see how running used motor oil will help that just to save a few dollars.