different fluids and solution "refract" at different angles and give differing readings not knowing what the washer fluid (type or brand) and even if it is real in that some say winter are NOT. So not knowing what was used you will have to "windage" calibrate your readings to what you want...
use it where the API, SAE Etc specs and viscosity are applicable. they are there to keep you out of trouble and make most quality oils interchangeable other than some persevered advantages, any of which you need lab testing to see. Keep it clean and change at correct OCI for your vehicles use...
I really do not know love to hear some comments. So far my feeling is they are too thin for older cars. However in newer engines that ARE designed for them then use them, but till more info I will be minimum 0/20, 5/20wt.
worked with estolides in cutting oils they do help but currently availability of them is small.
Ahh here is a hint read the SDS. They use 3 or 4 solvents that clean and then allow the basic chemistry to Hold debris until oil change.
i do not know Aniline point may test next time I do a oil...