Originally Posted By: edwardh1
do the oil labs tell you anything thing about how your filter is working, say a farm ultra on its 3rd 5000 oil change?
Maybe.
One of the things that you'll find in any UOA is a measure of insolubles.
You'd have to run a few back to back runs of a cheapo jobber filter and then a few back to back runs of the current BITOG flavor of the month Ultra to determine whether the oil filter actually made any difference.
It might, but I'm guessing that the difference would be small and maybe just lost in the background noise.
Does filter efficiency matter?
Given the low efficiency of most Japanese OEM oil filters put on engines that typically lead long, low oil consumption lives, it may well not.