Does anyone know the best place to send a sample of my oil for analysis?

Changed out all my fluids to Schaeffers today, everything looked pretty good except for the oil which looked pretty gnarly.

Since I don't know much about the trucks history I want to send in a sample of the oil that came in the truck for analysis but it looks like there is nobody local and there are too many options online for a noon to narrow down.

Has anyone done this and had good luck with any specific companies?