The Slick 50 bottle tells you to shake it before you pour it in your engine. Now once in your engine guess whats gonna immeditaley clog up your oil filter? Those same useless particles that you had to shake before just to get out of the bottle. I for one dont want those particles clogging up passageways in my engine.

I stick with Synthetic fluids if you really want the ultimate protection which isnt just a bunch of snake oil.