Have a FWD Ford CD4E transmission with a drain plug and I'd like to start doing regular drain/fills on it every few oil changes or something. Anyway, it calls for Mercon V. Any recommendations or preferences to keep my transaxle happy? Also, what are your thoughts on installing an external inline filter on one of my cooler lines? There is no serviceable filter on these transmissions. I could likely even get one for a PH2 filter like my engine takes. Bulk discounts, yo.