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Schaeffer's Racing Oil SynShield® Ultra Performance 10W-30 (1) 1-Quart Jug SKU: 0722-012 SynShield® Ultra Performance 10W-30 Diesel Engine Oil is a premium performance, synthetic plus, heavy-duty diesel engine oil formulated to provide maximum protection against wear, oxidation, deposit formation, soot contamination and aeration. SynShield® Ultra Performance 10W-30 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 10W-30 diesel oil creates a slippery, tenacious shield that prevents metal-to-metal contact for increased engine durability and efficiency. Performance Benefits Meets and exceeds API CK-4. Severe service engine protection your budget will appreciate. Fuel economy benefits even in adverse operating conditions. Oil durability: excellent oxidation and viscosity control with less oil consumption. Keep-clean performance: superior soot busting, deposit-dispersing capability. Friction modified with Micron Moly® and Penetro®. Meets Ford spec WSS-M2C171-F1.MADE IN THE USA!!!