Chevrolet Low Cab Forward 2023 Manual page 200

Caution
When adding oil, be careful not to spill
any, but keep a workshop rag handy just
in case there are any spills. If any oil
should spill onto the engine, carefully
wipe it away. If this precaution is not
taken, the spilled oil could ignite and a
fire could spread.
Do not leave flammable items, such as
rags or gloves, in the engine
compartment. They could cause a fire.
You and others could be seriously injured.
Engine oil lubricates and cools the engine's
internal components. The quality of the oil
is degraded and the quantity of oil is
reduced by evaporation, discharge and
combustion during the operation of the
engine. Continually using the same oil
without checking the level, or without
replenishing and changing it could cause
seizure or damage to the engine.
Prevent dirt from entering the filler port
when adding the oil. If foreign matter mixes
with the oil, it could damage the engine.
Adding oil above the "FULL" mark on the oil
dipstick could result in faulty engine
operation. Be sure to check the oil level by
using the oil dipstick.
Failure to use Cummins-recommended
engine oil could result in engine or DPF
breakdown, or in poor fuel efficiency.
Choosing the Right Quality Oil
If you do not use the oil intended for a
vehicle equipped with a Diesel Particulate
Filter (DPF), both the engine and the DPF
may break down and fuel economy may
decrease. Be sure, therefore, to use the oil
intended for vehicles equipped with DPF.
Vehicle Care
Oil Identification Logo
A logo (symbol) is used on most oil
containers to help you select the oil you
should use. The top portion of the logo
shows the oil quality by API designations
such as CK-4. The center portion of the logo
shows the SAE viscosity grade, such as SAE
*W-40 (* indicates viscosity on the low
temperature side). To determine the
viscosity required for your vehicle's diesel
engine, see "Engine Oil Viscosity Chart" in
this section.
199