So then the question becomes, what is the appropriate way to size a filter at a given micron rating? Or how would one determine the flow rate through the cooler?
Virtually all spin-on filters have a bypass valve, as does the Magnefine. This eliminates the danger of clogging. You determine the flow rate through the cooler circuit by running a hose into a
bucket and timing the flow with the engine running. For instance, the flow rate for a Jeep AW4 cooler circuit is 3/4 quart per minute. The flow rates for spin-ons and Magnefines are many times
greater than what's needed in transmissions.