See also:

Engine oil
...

Vehicle storage
If you plan on storing your vehicle for an extended period of time (30 days or more), refer to the following maintenance recommendations to ensure your vehicle stays in good operating condition. ...

Guarding against exhaust fumes
WARNING: If you smell exhaust fumes inside your vehicle, have your dealer inspect your vehicle immediately. Do not drive if you smell exhaust fumes. Carbon monoxide is present in exhaust fumes. T ...