You grossly underestimate the scale I operate at or are you intensionally playing dumb to try and make it seem like I only use reclaimed oil this one time on one engine?
Reclaimed oil saves gallons of bar and chain oil alone every year.
If every mower I repaired only got the oil drained and...
Probably 4 reasons.
1 the 2stroke gas can happened to be closer.
2 the only gas I happened to have is 2stroke gas.
3 burn off old 2 stroke gas to get fresh gas or oil.
3a someone gave me premix like trufuel and I'm burning it up in my mower.
4 do it because for some reason it drives people...
Ok now you're just repeating how lubrication work in each engine, which was never in question.
I have no idea why you think 2 stroke oil will do one thing in a 2 stroke engine and then do something completely different in a 4 stroke engine. What happed to all the carbon that is supposed to clog...