International DuraStar

The International MV, known as the 4000 series prior to 2008 and the DuraStar from 2008 to 2018, is a line of medium-duty trucks produced by Navistar International since 2001. Introduced as the successor to the International 4000 series of 1989–2001, the 4000 series was renamed the DuraStar in 2008. Sharing its chassis with the medium-duty Ford F-Series, the International DuraStar competed against chassis cab vehicles derived from pickup trucks, such as the Freightliner M2 and the Hino 600, Developed as a Class 6-7 product range, the 4000/DuraStar was slotted below the 8000/TranStar regional-haul semitractor, with the Class 5 International TerraStar (2010–2015) serving as the smallest International conventional-cab product range.

The most distinctive features of the DuraStar are the "crescent shape" headlights and a distinctive "black spot" on the left side of the cab. Produced as both a semitractor and a straight/rigid truck, the 4000/DuraStar has been used in a wide variety of applications, including emergency vehicles, towing, flatbed trucks, and cargo box trucks. For bus use, the chassis is used in both cowled-chassis and cutaway-cab configurations for school bus and commercial applications.