Chevrolet 4500HD Series 2019 Manual page 248

The engine oil level must be kept at
the right level to help assure proper
lubrication of your vehicle's engine.
It is the owner's responsibility to
check the oil level at regular
intervals (such as every fuel stop),
according to the following
instructions. Park the vehicle on a
level surface and check the engine
oil level before starting or at least
30 minutes after turning off the
engine.
1. Remove the oil dipstick (2) and
wipe off any oil on the oil
dipstick.
2. Reinsert the oil dipstick fully
and then gently remove it.
The oil is at the correct level if
the oil level is between the
"FULL" and "MIN" marks.
3. If the oil level is too low, add oil
to the "FULL" mark.
4. Reinstall the oil dipstick into
position after checking the oil
level.
Any oil level above the "FULL" mark
on the oil dipstick may cause engine
malfunctions.
Vehicle Care
The oil level cannot be checked
correctly when the engine is
running.
If the engine has been running, wait
at least 30 minutes before checking.
Adding the Engine Oil
When the engine oil level is near or
below the "MIN" mark on the oil
dipstick, remove the oil filler cap (1)
and add the oil. Remove the oil
dipstick (2) at this time. Use only the
specified engine oil.
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