See also:

To Check the Oil Level
Before checking the oil, warm up the engine to the normal operating temperature and be sure it is parked on level ground. Turn the engine off. Wait five minutes, then remove the dipstick, wipe it ...

Changing the engine oil and filter
...

Door Locks
WARNING: o Unlocked doors can be dangerous. Before you drive away (especially if there are children in the car), be sure that all the doors are securely closed and locked so that the doors cannot ...