Jim, Thanks for the links on the oil filters. I just confirms for me, why I run the NAPA/WIX filter lines. When I drove truck we went 15,000 mi. between changes and changed FILTER ONLY at 7500 mi. and then topped off the oil, with no service issues. I run the NAPA GOLD #1773 a longer in size filter with a 1/2 QT oil capacity. Glad to know I can get the same filter at Carquest or use a Baldwin/Hastings when I can find them... Thanks, Dave