Cummins said its 2020 X15 Productivity Series ratings are designed for multi-purpose, vocational and heavy-haul customers who need a wider engine speed range. Cummins will expand its lineup of X15 diesel engines with two new additions to the family – a new X15 Efficiency Series engine and a new X15 Productivity Series diesel engine.  According to Cummins, the 2020 X15 Efficiency Series engine delivers up to 5% better fuel economy than the prior X15 Efficiency Series engine and is designed for increased uptime and improved driver satisfaction. It has a new maintenance schedule, including an oil-drain interval of up to 75,000 miles. An oil drain interval of up to 80,000 miles is available to customers using Valvoline Premium Blue 15W-40. For added value, customers participating in Cummins OilGuard program have the potential to increase to a 100,000-mile ODI. These extensions will decrease maintenance costs and improve vehicle uptime for customers, all while protecting their coverage under warranty should they need it, Cummins said. “We are proud of the performance and reliability of the X15 engine platform,” said Brett Merritt, vice presidentt of Cummins’ On-Highway Engine B...