When overdrive equipped vehicles fist came into the inventory, it was advised to not use the overdrive option while driving in town, but to use it when driving on highways.  This recommendation has been dropped as the history of problems with these units showed no relationship with failures due to in-town use of overdrive.

Therefore, you can use the overdrive position anytime.  However you may want the manually select the normal position when driving on highways in hilly terrain to avoid a “busy” shifting transmission especially while using cruise control.

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