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Sierra NMMA FC-W Catalyst Compatible Oils have been specifically designed to meet the unique requirements of modern four-stroke recreational engines with or without emission catalyst systems. Since recreational engines are often used in extreme operational and environmental conditions, robust oil is required to provide adequate protection. Utilizing premium base stocks and industry leading additive technology, Sierra Catalyst Compatible Oils excel. Sold in case packs only. Industry leading wear protection and deposit control for engine longevityMinimize internal engine corrosionEnhanced detergent and dispersants properties suspend and prevent engine sludge formationReduced engine frictionHigh quality base stocks prevent thermal and oxidative breakdownHighly shear stable viscosity stabilizers prevent excessive thinningAdvanced, highly thermally stable "ZDDP" anti-wear additive technology prevents phosphorus depletion and extended catalyst life