OVERKILL
$100 Site Donor 2021
You are greatly over-thinking this.
Oil by itself doesn't go bad. It gets diluted with fuel, wear metals, combustion byproducts...etc and is required to keep acids neutralized and those contaminants in suspension. As long as those things can be done successfully, it will continue to be serviceable. When you change the oil, a small amount of residual lubricant, laden with the amount of contaminants that was consistent with the entire sump contents before it was changed, remains. Note that you've removed >80% of those contaminants with the change. Upon fire-up with fresh oil, those contaminants are immediately diluted in the new oil and cease to become relevant. Then the process repeats as the engine is operated. As long as the lubricant is not operated beyond its ability to perform those tasks, you will not experience sludge or other negative consequences.
Oil by itself doesn't go bad. It gets diluted with fuel, wear metals, combustion byproducts...etc and is required to keep acids neutralized and those contaminants in suspension. As long as those things can be done successfully, it will continue to be serviceable. When you change the oil, a small amount of residual lubricant, laden with the amount of contaminants that was consistent with the entire sump contents before it was changed, remains. Note that you've removed >80% of those contaminants with the change. Upon fire-up with fresh oil, those contaminants are immediately diluted in the new oil and cease to become relevant. Then the process repeats as the engine is operated. As long as the lubricant is not operated beyond its ability to perform those tasks, you will not experience sludge or other negative consequences.