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July 2026

PACCAR Releases MX-11 and MX-13 Engine Software Updates Following EPA Derate Change

By Tyler Williams on July 8, 2026 Emissions Standards,Engines,Kenworth News

Read Time: 2 Minutes | PACCAR just announced that Kenworth and Peterbilt will both implement software updates for trucks equipped with MX-11 and MX-13 engines that reflect the EPA’s newly revised guidance on Diesel Exhaust Fluid (DEF) inducements.

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Archive for July, 2026