Specifically designed for marine engines that are "seasoned" or have been in service for a few years, the robust Pennzoil Marine XLF (Extended Life Formula) is a synthetic blend outboard two-cycle oil that's formulated with an extra level of performance additives to protect outboard engines under the most severe operating conditions. Uniquely formulated with ashless dispersants, Pennzoil Marine XLF helps keep your engine running clean, guards against harmful engine deposits, and protects against piston scuffing. It also keeps performance-robbing carbon deposits from forming in the combustion chamber, piston tops, and under crowns and piston-combustion rings, as well as keeps exhaust ports clean. Certified by the National Marine Manufacturer's Association (NMMA) as an approved NMMA TC-W3 lubricant, it is recommended for and meets the warranty requirements of outboard engines produced by the following manufacturers: Johnson/Evinrude/OMC, Mercury, Yamaha, Suzuki, Nissan, Force/US Marine, Mariner, and others. Shelf Description