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| 2008 Certified Engines |
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| Caterpillar C13 / C15 |
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| Cummins ISX* |
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| Detroit Diesel DD15 / S-60 |
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| Hino J08E-TW* |
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| International MaxxForce 11/13 |
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| Mercedes-Benz MBE 4000 |
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| Mack/Volvo D11* / D13* / D16* |
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| Westport ISXG |
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| Western Truck Parts & Equipment Co. |
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| Redding Kenworth Company |
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* Clean Idle Certified Engine |
