This is the biggest oil filter in the fleet at work. It's a Wix 57744XD (Xtended Drain) for an International School Bus with a Maxxforce engine. Really just wanted to see inside one of these XD filters, they seem to have a main element and a "bypass" element, the smaller of the two possibly for finer filtering? We run these about 6 months and/or 6,000 miles with bulk 15W-40 conventional oil. The pic of it in the oil drain caddy is next to a Ford FL500S for size reference. Enjoy the pics.
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