The International Harvester S-Series was a medium-duty truck line made by International Harvester from 1978 to 1992. It served as a gradual replacement for the International Harvester Loadstar, which was last produced in 1979. Like the Loadstar, the S-Series trucks were commonly used for local delivery vehicles, and for school buses.
Most of the components were carried over into a new line of medium duty trucks with a redesigned hood and interior in 1991, and an update of the interior in 1995 until the model's discontinuation in 2001.
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