Engine Oil Life System - GMC 2010 T-Series Owner's Manual

Look for this on the oil container, and use only
those oils that display this logo.
Notice: Use only engine oils that have the
designation CJ-4 for the diesel engine. Failure to
use the recommended oil can damage the DPF and
result in engine damage not covered by the vehicle
warranty.
Engine Oil Additives
Do not add anything to the oil. The recommended oils
with the API service symbol are all you need for good
performance and engine protection.
This doughnut-shaped
logo (symbol) is used on
most oil containers to help
you select the correct oil.
It means that the oil has
been certified by the
American Petroleum
Institute.
When to Change Engine Oil (Vehicles
Without the Engine Oil Life System)
Change the engine oil and filter every 24 000 km
(15,000 miles), or every 12 months, or every 750 hours
of engine operation, whichever occurs first. If the
vehicle is used primarily for long trip, highway service,
change the engine oil and filter every 28 800 km
(18,000 miles), or every 12 months, or every 750 hours
of engine operation, whichever occurs first. See
Scheduled Maintenance on page 6 5.

Engine Oil Life System

When to Change Engine Oil
If the vehicle has the Engine Oil Life System, it has a
computer system that indicates when to change the
engine oil and filter. This is based on injection timing,
engine load, and engine temperature, and not on
mileage. Based on driving conditions, the mileage at
which an oil change is indicated can vary considerably.
For the oil life system to work properly, the system must
be reset every time the oil is changed.
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