Exceeds API Service Categories for heavy-duty-diesel engine oil: CK-4, CJ-4, CI-4, CI-4 Plus and older is a premium advanced performance, full synthetic, heavy-duty diesel engine oil formulated to provide maximum protection against wear, oxidation, deposit formation, soot contamination and aeration. SynShield® Ultra Performance 5W-30 Full Synthetic Engine Oil is built for on-highway and off-highway applications subjected to severe stop-and-go, excessive idling, short haul and/or severe duty operating conditions. Using our proprietary friction modifiers, Micron Moly® and Penetro®, SynShield® Ultra Performance 5W-40 Engine Oil creates a slippery, tenacious shield that prevents metal-to-metal contact for increased engine durability and efficiency .Our fully synthetic 5W-40 oil is suitable for use in 2007 and 2010 emission compliant engines that utilize heavy exhaust gas recirculation (EGR) and exhaust after-treatment devices such as diesel particulate filters (DPFs) with or without diesel oxidation catalysts (DOCs) and selective catalytic reduction (SCR). SynShield® Ultra Performance 5W-40 Full Synthetic Oil can also be used in low-emission certified diesel engines that are equipped with EGR, older non-EGR containing diesel engines, and off-highway diesel engines. Performance Benefits Improved wear protection – 85% less wear than conventional CJ-4 oils. High thermal and oxidative stability for greater resistance to viscosity thickening and the formation of deposits, sludge and varnish. Strong soot-busting, deposit-dispersing capability – 77% greater soot handling than conventional CJ-4 oils. Maintains fuel economy. Excellent shear stability for stay-in-grade performance throughout the oil drain interval. Superior low volatility characteristics to control oil consumption. Improved and optimized engine durability and reliability during high mileage, hour accumulation situations. Excellent protection against oil aeration and foaming. Excellent cold crank startability and low temperature pumpability.