GMC Yukon/Yukon XL/Denali Owner Manual (GMNA-Localizing-U.S./
Canada/Mexico-13690468) - 2021 - CRC - 2/18/20
Vehicle Care
315
11. Windshield Washer Fluid Reservoir. See
“
Adding Washer Fluid
”
under
.
Engine Oil
For diesel engine vehicles, see
“
Engine Oil
”
in the Duramax diesel supplement.
To ensure proper engine performance and
long life, careful attention must be paid to
engine oil. Following these simple, but
important steps will help protect your
investment:
.
Use engine oil approved to the proper
specification and of the proper viscosity
grade. See
“
Selecting the Right Engine
Oil
”
in this section.
.
Check the engine oil level regularly and
maintain the proper oil level. See
“
Checking Engine Oil
”
and
“
When to Add
Engine Oil
”
in this section.
.
Change the engine oil at the appropriate
time. See
.
Always dispose of engine oil properly. See
“
What to Do with Used Oil
”
in this
section.
Checking Engine Oil
Check the engine oil level regularly, every
650 km (400 mi), especially prior to a long
trip. The engine oil dipstick handle is a loop.
See
for
the location.
{
Warning
The engine oil dipstick handle may be
hot; it could burn you. Use a towel or
glove to touch the dipstick handle.
If a low oil Driver Information Center (DIC)
message displays, check the oil level.
Follow these guidelines:
.
To get an accurate reading, park the
vehicle on level ground. Check the engine
oil level after the engine has been off for
at least two hours. Checking the engine
oil level on steep grades or too soon after
engine shutoff can result in incorrect
readings. Accuracy improves when
checking a cold engine prior to starting.
Remove the dipstick and check the level.
.
If unable to wait two hours, the engine
must be off for at least 15 minutes if the
engine is warm, or at least 30 minutes if
the engine is not warm. Pull out the
dipstick, wipe it with a clean paper towel
or cloth, then push it back in all the way.
Remove it again, keeping the tip down,
and check the level.
When to Add Engine Oil
If the oil is below the cross-hatched area at
the tip of the dipstick and the engine has
been off for at least 15 minutes, add 1 L (1
qt) of the recommended oil and then
recheck the level. See
“
Selecting the Right
Engine Oil
”
later in this section for an
explanation of what kind of oil to use. For
engine oil crankcase capacity, see
.
Caution
Do not add too much oil. Oil levels above
or below the acceptable operating range
shown on the dipstick are harmful to the
engine. If the oil level is above the
operating range (i.e., the engine has so
(Continued)
