Cadillac 2003 CTS, Owner'S Manual

Page: 339 / 435

6-13
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 change your own
oil, be sure you use oil
that has the starburst
symbol on the front of the
oil container. If you have
your oil changed for you,
be sure the oil put into
your engine is American
Petroleum Institute certified
for gasoline engines.
You should also use the proper viscosity oil for your
vehicle, as shown in the viscosity chart.
SAE 10W
-
30 is best for your vehicle. However, you can
use SAE 5W
-
30 if it’s going to be colder than 60
_F
(16
_C) before your next oil change. When it’s very cold,
you should use SAE 5W
-
30. These numbers on an oil
container show its viscosity, or thickness. Do not use
other viscosity oils, such as SAE 20W
-
50.