Coastal Fleet 15W-40 CI-4/SL Diesel Engine Oil is a premium quality, multi-grade engine oil for all-season use in commercial mixed-fleet engine operations. It is guaranteed to meet or exceed the performance requirements for naturally aspirated, turbocharged and supercharged diesel engines, requiring API Service Classification CI-4, as well as gasoline engines requiring API SL or SJ.

It is not for use in EGR equipped diesel engines manufactured after 2007. Coastal Fleet 15W-40 CI-4/SN Diesel Engine Oil provides API Service CI-4, CH-4/SL, SJ and previous API Categories