Regarding fuel additives, do you believe lubricity is the greater concern? Or is the additive's cleaning ability as important?

Reason I'm asking: One new engine supplier (known to this forum) mentioned to me that I could use "low-ash, 2-cycle snowmobile oil" as a good fuel lubricity additive. (aka: "snowmachine" oil, here in Alaska) From what little I've read, it should meet API-TC ratings (not merely TC-W3). If it's a mineral-based oil, it's supposed to stay well-mixed with diesel in cold weather.

Other well-respected product suppliers (also known to this forum) use diesel fuel treatments with lubricity additives included.

On YouTube, there are some "lubricity tests" utilizing a simulated bearing being skidded across a rotating race, with force being applied and measured using a torque wrench lever. Scarring of the bearing surface is less with certain products. I'm left wondering if these tests are even applicable for fuel treatment lubricity purposes.

Thought the good folks, here, would know best.