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I guess the "(if equipped with this feature)" bit means that some trucks don't show the percentage, only "OK" (somewhere between new oil and 1 year/10,000 miles), "ENGINE OIL CHANGE SOON" (within two weeks/500 miles), and "OIL CHANGE REQUIRED"?
p. 71 of the Diesel Supplement says to go 6 months/5,000 miles between oil changes if the information display becomes inoperative, and never exceed 1 year/10,000 miles between oil changes.
Last edited by sobiloff; 04-16-2013 at 07:54 AM.
Reason: Expanded answer