[Kurt in NJ]

I have done some research of sae and other papers----
particles under 25 microns most harmful to rings and bearings
.001 is about 25 microns

"full flow"----most full flow filters have a internal bypass that opens at 2-10 lbs drop through the filter--then little of the oil is filtered,---cold and thick oil will keep the bypass open longer

full flow, 85% capture single pass
40% @10 microns
60% @ 20microns
93% @ 30 microns
97% @ 40 microns


bypass filter
98% @ 2 microns , about 5 quarts filtred every 10 min

ideally both types of filters are used, the old Benz diesels had just a bypass filter, and a full flow screen(like the one in the ad with million miles), the 80s, 90s ones have both full flow paper and a depth bypass filter, bearings still look new at 300,000+ miles