Triden Triad Full Synthetic 15W-40 Engine Oil is a premium quality, high performance formulation of 100% synthetic base oils and the most advanced additive technology available that meets or exceeds the service requirements of virtually all diesel engine manufacturers; both 2007 emission compliant and older engines, as well as new engines using SCR or EGR systems for 2010 EPA emission compliance. It is suitable for virtually all on- and off-highway service applications and can be used in extended drain service programs.