Engine Oil Additives - Cadillac 2008 XLR Owner's Manual

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.
Your vehicle's engine is filled at the factory with a
®
Mobil 1 synthetic oil, which meets all requirements for
your vehicle.
Oils meeting these
requirements should have
the starburst symbol on
the container. This symbol
indicates that the oil
has been certified by the
American Petroleum
Institute (API).
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. Substitute oil not meeting GM Standard
GM4718M should not be used for an oil change.

Engine Oil Additives

Do not add anything to the oil. The recommended oils
with the starburst symbol that meet GM Standard
GM4718M are all you need for good performance and
engine protection.
6-19