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There is no truth to this. WM is the 800 pound gorilla and can put intense pressure on their suppliers to cut the cost to WM. This allows them to undercut many others. JL, just like many car dealers, may buy oil in 55 gallon containers at a discount. It’s all the same oil, no matter the size of the container.
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There is some recycled oil out there but it’s usually sold in quick shops/small stores under obscure names and will state this on the bottle. The only thing it’s good for is topping off a car if you’re in a real pinch and there is nothing else around.
This comment could raise some ethics concerns about your mechanic.