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COLUMBUS, Ind. – Cummins has unveiled its 2021 X12 and X15 engine lineup, expanding the use of several features that have been limited to X15 Efficiency Series engines. Fuel economy and oil drain intervals are experiencing a boost as well. “Both the X15 and X12 share a market-leading 75,000-mile (120,000-km) interval for trucks getting seven […]
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