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ATTENTION:
DEALER PRINCIPAL
SERVICE MANAGER
SALES MANAGER
SUBJECT: TECH-TIPS # 22 / 2007.5 D1/DH TRUCKS EQUIPPED WITH 6.7L DIESEL ENGINES –
ENGINE OIL CHANGE INDICATOR SYSTEM
Subject trucks are equipped with a new engine oil change indicator system that will cause a “Change Oil”
message to flash in the instrument cluster odometer or on trucks equipped with an Electronic Vehicle
Information Center in the overhead console an “Oil Change Required” message will be displayed. The
engine oil indicator system is duty cycle based, meaning the engine oil change interval may fluctuate
because it’s dependant upon a driver’s driving style. Driving styles such as frequent stop and go type
driving can increase the frequency of the engine oil change. This is the result of more frequent
regeneration of the exhaust after-treatment system, which can decrease the life of the engine oil. Failure
to change the engine oil per the maintenance schedule can result in internal engine damage. Refer to the
Owner’s Manual for information regarding resetting the Oil Change Indicator message after performing
the required schedule maintenance.
NOTE: IT IS POSSIBLE FOR THE MAXIMUM ALLOWABLE MAINTENANCE TIME INTERVAL TO
ELAPSE WITHOUT AN OIL CHANGE REMINDER. IN SUCH A CASE, IT IS THE OWNER’S
RESPONSIBILITY TO ENSURE THAT MAINTENANCE IS PERFORMED ACCORDING TO
THE RECOMMENDED INTERVAL. UNDER NO CIRCUMSTANCES SHOULD OIL CHANGE
INTERVALS EXCEED 12,000 KILOMETRES OR 6 MONTHS, WHICHEVER COMES FIRST.
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