The Crankshaft Seal keeps the engine oil at the front portion of the crankcase so that oil can supply lubrication on the bearings and other parts. It prevents the parts from being dry, and friction does not take place in a dry condition at the internal parts. The Crankshaft Seal is a ring of metal bonded to a flexible rubber lip to hug the snout of the spinning crankshaft and prevent the escape of pressurized oil. The Crankshaft Seal in a Subaru engine maintains proper oil level, helps prevent leaks, and reduces wear. As mileage accumulates, however, the rubber can harden and tear, causing tell-tale drips underneath the engine and a slick coating on nearby belts. Though the underlying design is the same with every Subaru Forester generation, earlier models applied a slightly thicker rubber composition while later ones applied more refined compounds that can better resist heat and chemicals, which makes it fail less often. Even with these modifications, the functionality is the same; the Crankshaft Seal sits on the crankshaft, and its tensioned edge seals the oil out. The seepage vigilant Subaru Forester drivers must check for since a failing Forester Crankshaft Seal can cause a low oil situation with more friction and expensive engine damage.
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