Glass Heavy Duty 15W40 Diesel Engine Oil is the latest generation premium heavy-duty motor oil that meets or exceeds the service requirements of virtually all diesel engines manufactured—including 2017 greenhouse gas (GHG17) compliant, EPA 2010 low emissions requirements with SCR, DFP and EGR systems. This innovative product is compatible with all previous API diesel engines service categories for older engines in both on- and off-highway applications