Engine Oil Additives - Cadillac 2005 CTS Owner's Manual

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SAE 5W-30
As shown in the viscosity chart, SAE 5W-30 is
best for your vehicle.
These numbers on an oil container show its
viscosity, or thickness. Do not use other viscosity
oils such as SAE 20W-50.
You should look for this on the oil container, and use
only those oils that are identified as meeting GM
Standard GM4718M and have the starburst symbol
on the front of the oil container.
Oils meeting these
requirements should also
have the starburst
symbol on the container.
This symbol indicates
that the oil has been
certified by the American
Petroleum Institute (API).
Your vehicle's engine is filled at the factory with a
®
Mobil 1 synthetic oil, which meets all requirements for
your vehicle.
Substitute Engine Oil: When adding oil to maintain
engine oil level, oil meeting GM Standard GM4718M
may not be available. You can add substitute oil
designated SAE 5W-30 with the starburst symbol at all
temperatures. If temperatures are above 0°F (–18°C),
you may substitute SAE 10W-30 with the starburst
symbol. Substitute oil not meeting GM Standard
GM4718M should not be used for an oil change.

Engine Oil Additives

Do not add anything to your oil. The recommended
oils with the starburst symbol that meet GM Standard
GM4718M are all you will need for good performance
and engine protection.
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