Outer Limits 4x4 Board

Advertised in 4WD action. Has anyone tried one / confirmed results?

Yeah I know, I know, toilet paper, grandfathers tractor etc .

Someone must have tried one of these, then had a before / after oil analysis done?

Thanx
Paul

we have installed the same sorta filters on customers machinery and yes they do work, they do remove alot of crap from the oil. replacement filters can be quite $$ though