Since its debut in 2012, the Model 579 – now Peterbilt's on-highway flagship – has received a few of the aforementioned refinements, like the addition of the hyper-aerodynamic EPIQ package in 2014 and long-awaited integrated sleeper, UltraLoft, four years later. Beyond those, design or technology upgrades were incremental and subtle.
When Peterbilt debuted its refreshed Model 579 last year it marked a fairly significant revamp – at least for Paccar, which has historically favored small refinements over full-blown reinvention.
Contents of this video
00:00 intro to Peterbilt 579
01:04 updated front end design
03:03 aerodynamic features
05:38 engine
06:21 design features
08:04 interior
10:08 Ultraloft sleeper
11:33 test drive
For more on the Peterbilt 579 checkout the article on our website.
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![](https://i.ytimg.com/vi/5leexuXG120/maxresdefault.jpg)