Originally Posted By: ZeeOSix
ExMachina - cool STP oil filter ad from the 70s. Pretty high tech for those days.
.... And dig that efficiency vs. hours run graph. They say a lot of filters increase in efficiency slightly for a while, then start going down in efficiency. I think its because the pores start a little erosion, opening up while oily/hot over the long term, just guessing though. But, yeah, what happened to ads like that, and oil filters like that? MicroGreen has seemed to re-discover something like it, yet where is Fram, Puro, etc. with this kind of HD truck-like oil filters for consumers??? From the ad: "Left there they (grit) can play [censored] with the guts of an engine."