The sunroof has an automatic reversal system that is only active when the sunroof
is operated in express-close mode.
If an object is in the path while express-closing, the reversal system will detect
an object, stop, and open the sunroof slightly...
Other information:
This maintenance section applies to vehicles with a gasoline engine. If the vehicle
has a diesel engine, see “Recommended Fluids and Lubricants” in the Duramax diesel
supplement.
Fluids and lubricants identified below by name, part number, or specification
can be obtained from your dealer...
Premium unleaded gasoline meeting ASTM specification D4814 with a posted octane
rating of 93 — (R+M)/2 — is highly recommended for best performance and fuel economy.
Unleaded gasoline with an octane rated as low as 87 can be used. Using unleaded
gasoline rated below 93 octane, however, will lead to reduced acceleration and fuel
economy...