Issue link: https://read.dmtmag.com/i/730281
oil drain intervals as far as 80,000 miles. "Everything we have done on the X15 engines, whether to maximize efficiency or maximize performance, was done with the very conscious effort to make enhancements only if they would be dependable," said Fier. "Fuel economy and horsepower only matter if that vehicle is on the road." Light might The X12 Series engine ratings range from 350 to 475 horsepower and 1,250 to 1,700 lb-ft of torque and Cummins' best power-to-weight ratio at 2,050 lbs., 150 lbs. lighter than the next closest competitive engine, according to Cummins. Material has been removed from the block where possible, including the flywheel, add- ing structural support "ribs" to add strength and rigidity. "This engine was designed from the ground up to remove as much weight as we could while retaining superior dependability," said Fier. The X12 will share several compo- nents with the X15, including the Cummins Holset VGT Turbo, XPI fuel system, engine control module and single module aftertreatment system. After years of development and 9 mil- lion miles of testing, Cummins will be- gin limited production of the X15 late this year; full production will begin in January 2017. Customers wanting the X12 will have to wait until 2018. • 14 www.bigrigowner.com O C T O B E R 2 0 1 6 HPD