When To Add Engine Oil; What Kind Of Engine Oil To Use - GMC 2003 Sonoma Owner's Manual

When to Add Engine Oil

If the oil is at or below the ADD line, then you'll need to
add at least one quart of oil. But you must use the
right kind. This part explains what kind of oil to use. For
engine oil crankcase capacity, see Capacities and
Specifications on page 5-99 .
Notice: Don't add too much oil. If your engine has
so much oil that the oil level gets above the
cross-hatched area that shows the proper operating
range, your engine could be damaged.
5-16
Be sure to fill it enough to put the level somewhere in
the proper operating range. Push the dipstick all the way
back in when you're through.

What Kind of Engine Oil to Use

Oils recommended for your vehicle can be identified by
looking for the starburst symbol.
This symbol indicates that the oil has been certified by
the American Petroleum Institute (API). Do not use
any oil which does not carry this starburst symbol.
If you have the 2200 L4
engine, the engine oil fill
cap is located in the rear of
the engine compartment
on the passenger's side of
the vehicle. If you have
the 4300 V6 engine,
it is located in the rear of
the engine compartment
on the driver's side of
the vehicle.