With Expertise Built In™, the OTR Radiator for Peterbilt 357/385/377/378/379 features a better-than-OEM design that enhances airflow, coolant flow, and stagnation recovery. This is made possible due to the OTR re-engineering process which consists of virtual testing of failed units to reveal issues and improve upon the original design. As a result, this high-quality, reliable heavy duty truck radiator is constructed to endure large amounts of heat and stress over time. FleetPride is your First Click in Heavy Duty®.