For this test you just take their little container and fill it with the used oil when you change the oil.When I empty my catch can it smells like death.
then you note the mileage on the oil, the brand and viscosity, mileage on the engine, engine model.
put it in the mail and about 3 weeks later they generate your report.
It's a good way to get a idea of the engine health and if you do it on a regular basis it is a good way to
be able to address an issue before it gets worse