The purpose of the Toyota Highlander Crankshaft Seal is to retain engine oil at the crankshaft's front end. This round part is usually made from some combination of metal for strength and rubber for flexibility which permits the Crankshaft Seal to push up against the rotating metal shaft tightly. The Crankshaft Seal helps keep lubrication in the engine by preventing oil from leaking out of the crankcase, thus reducing friction and wear on moving parts. Located at the front of the engine, the Crankshaft Seal prevents dirt from entering the crankcase. Oil leaks underneath a parked Highlander indicate that the seal has worn and needs to be replaced. This is especially true for somewhat older and higher mileage vehicles after some time. While the Crankshaft Seal is a simple little part, it does a great job of protecting every engine in the Toyota Highlander. As such, it might seem small but it is a part of reliability in all Toyota Highlander models and of course, within Toyota overall.
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