The BMW 318is Differential Seal helps keep precious gear oil locked to the inside of the rear drive unit so power is given in a smooth and quiet manner to both wheels. Sized perfectly for every model of the chassis, the Differential Seal fits coupe, convertible, hatchback, and wagon variants of the 318is built between 1992 and 1997, giving owners one part that they can trust, no matter which BMW they are driving. A flexible synthetic rubber lip and coiled spring embrace the axle flange, allowing the Differential Seal to handle hot 75W-90 fluid and road grit which may otherwise rub gears and lead to increased repair costs. On spirited runs, the lighter 318is gets the benefit of the tougher fluorocarbon option, as this Differential Seal will handle the added heat of a limited slip without weeping, and differential temperatures will be kept in the safe zone, keeping the rear tires biting. Maintaining proper oil depth makes for a more efficient drivetrain and helps the car corner with confidence, so changing out a tired Differential Seal for a fresh unit from the factory is a quick way to gain better safety in any BMW of this 318is lineage. Unlike generic seals, this BMW engineered Differential Seal uses exact tolerance machining that withstands distortion at motorway speed, allowing the 318is to cruise at 213 km per hour without annoying whine. Drivers rave about how the BMW badge on every package is an indication of quality, but the true hero is the Differential Seal which keeps even high mileage 318is models feeling tight and responsive mile after mile. That reputation for reliability locks BMW in as a leader in driveline durability.
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