The Nissan Pathfinder Valve Stem Oil Seal helps keep engine oil from sneaking past the valve stems and into the combustion chambers. This protects power and emissions. The Valve Stem Oil Seal wraps around the stem tightly, feeding just enough oil to the guides while blocking off excess oil that would otherwise burn and foul plugs. This helps the valvetrain handle the high heat and rapid cycling that is put through the engine. As clearance increases in lifters, pushrods, or rocker arms and the pounding increases, that is fine if the Valve Stem Oil Seal is intact. It will still prevent excessive oil from getting in, which will create more misfire, valve float, or even damage the piston. Across Pathfinder model years, the fundamental elastomer-and-spring design of the Valve Stem Oil Seal has remained consistent because the proven layout already supports both overhead valve and overhead cam layouts. Consequently, Nissan owners receive the same reliable seal whether the camshaft is in the block with pushrods or overhead driving buckets or rockers. This Valve Stem Oil Seal seals the valve stem to maintain compression and reduce smoke while prolonging the life of the Nissan valve train. Every Pathfinder engine starts smoothly and delivers steady horsepower.
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