[Kurt in NJ]

I have taken some notes from SAE papers
.001=25.4 microns
particles under 20 microns most harmful to rings and bearings.
Bypass filters typically filter 5 quarts in 10 minutes.
Full flow filter—
40% @10 microns
60%. @20 microns
95%@30 microns
97%@40 microns

Bypass filter—98.7% captured @2 microns

Most full flow filters have a bypass valve inside opening at 7-15 pounds pressure drop through the filter, most likely cold thick oil will open it at startup , then no oil is being filtered