Has anyone seen any data on the upper limit for ISO Cleanliness Codes for used ATF versus a realistic "ideal" code? I'm finding numbers that vary widely and also suspect each AT manufacturer would have a specific spec. I'd like to find an "industry standard" number. I've seen an upper number as high as about 20/17/12(c) and as low as about 18/13 using the old measurements. Still researching this but any other good numbers, or references to them, would be appreciated.