Sierra - 25W-40 FC-W 4 Stroke Stern Drive Engine Oil - 5 Quart - 2 Pack - 9400CAT4 Want to know more about how your engine is breaking-in or wearing? Curious about whether or not your oil is doing its job? Want to be ahead of problems that may develop? PartsVu has partnered with Blackstone Laboratories and we are now offering professional oil analysis kits. Results are typically received in a few days via email. Shop now. 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. Industry leading wear protection and deposit control for engine longevity. Enhanced detergent and dispersants properties suspends and prevents engine sludge formation. Advanced, highly thermally stable "ZDDP" anti-wear additive technology prevents phosphorus depletion and extended catalyst life. This bundle contains four 5 Quart bottles. If you are looking for other quantities of