BMW 3.0S Differential Seal retains oil for calmer and more efficient rear gears. The Differential Seal is located where the driveshaft enters the housing of the unit. It is designed to withstand the heat and vibration that it sees. It also stops the lubricant from coming into contact with dirt and rain. The Differential Seal's ability to maintain pressure has drivers appreciating how the BMW sedan handles tightly in corners and one wheel can rotate at a speed that suits it optimal. The entire range of 3.0S variants, starting from early carbureted sedan to the later fuel injected runabout, accept the same sizing. Thus, this Differential Seal will fit all of them, and that cross compatibility saves on replacement time and cost. The standard rubber versions already comply with the tolerances specified by BMW's factory. The performance option features a flanged lip that grips more vigorously without complicating the installation. Both have the smart latex coated bore that allows the Differential Seal to maintain centricity even if there is slight housing wear, a feature praised for reliability during spirited 3.0S highway pulls. It is easy to change the Differential Seal without removal of the axle. Therefore, the service is simple with less downtime, avoiding expensive repair of the gears. The synthetic compounds applied since mid series 3.0S stay in place and resist evaporation. This means that the Differential Seal will keep the viscosity stable for many seasons. The result is improved drivetrain efficiency and limited temperature spikes under load. This added thermal margin plus the tried-and-trusted engine reliability from BMW aids safety from losing oil instantly from a locked wheel or a destabilized chassis. In the end, fans appreciate the Differential Seal because it lets the 3.0S sedan and the 3.0S touring maintain their lively character, reinforcing BMW's tradition of lasting strength.
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