I have been changing mine every 5,000 mile for a while. Truck runs fine. With the synthetic oil it still looks half way good during the change.
Gonefission
Bill
every 3k,,as some one else posted after that the breakdown of the oil starts to do bad things(sluge,and other goodies)jmo
IT'S 5--O-CLOCK SOMEWHERE,,,MIKE-p
PROUD MEMBER OF TEAM GEEZER