The doors will lock automatically when all doors are closed, the ignition is on, and the vehicle is shifted out of P (Park).
If a vehicle door is unlocked and then opened and closed, the doors will lock either when your foot is removed from the brake or the vehicle speed becomes faster than 13 km/h (8 mph).
To unlock the doors:
on the power
door lock
switch.Automatic door locking cannot be disabled. Automatic door unlocking can be programmed. See Vehicle Personalization.
Delayed Locking
Lockout ProtectionFluid and Lubricant Recommendations
Fluid and Lubricant RecommendationsUsageFluid/LubricantEngine OilUse only engine oil licensed to the dexos1 specfication, or equivalent, of the properSAE viscosity grade. ACDelco dexos1 Synthetic Blend is recommended.Engine Coolant50/50 mixture of clean, drinkable water and use only DEX-COOL Coolant ...