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January 12, 2023 Service bulletin

This campaign is the final opportunity to replace the oil filter screw cap to reduce occurrences of broken...

Kenworth technical service bulletin E303 for 2018-2021 Kenworth T680, 2018-2021 Peterbilt 579 and 2018-2020 Kenworth T800 and others.

Bulletin number
E303
Component
Engine and engine cooling
Summary
This campaign is the final opportunity to replace the oil filter screw cap to reduce occurrences of broken bypass valve tabs. Broken oil valve tabs can cause oil flow obstruction to critical engine parts, resulting in serious engine damage. Customers that do not receive this repair may be responsible for progressive engine damage caused by broken oil bypass valve tabs.

Owners of these vehicles have filed 5 complaints in the engine category.

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