Ford F150 1997 Owner's Manual page 196

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• 20 minutes of driving in stop
and go city-type traffic with at
least four idle periods.
• 10 minutes of driving on an
expressway or highway.
Before completing the above
driving modes, the engine must be
warmed up and at operating
temperature. Once started, the
vehicle must not be turned off
during the above driving modes.
Maintenance and care
197

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