The purpose of the BMW 850CSi Differential Seal is to restrain the crucial gear oil within the rear differential while shutting off the water and grime. A simple part can give you wonderful reliability gains and performance benefits. This Differential Seal is a ring of fluoroelastomer with precise lip tension along with a microfilm of lubricant that provides minimum friction between the rotating axles that spin at different speeds in tight corners. The same trusted part can go into any 850CSi made from 1994 to 1996. So whether your BMW stays stock in a museum or now takes track abuse on the weekends, this part fits. There are two factory styles: an everyday Differential Seal made of tough synthetic rubber and a performance Differential Seal with a molded flange and heat resistant bore coat. Each aims to prevent leaks without materially harming efficiency. The Differential Seal maintains constant pressure thus allowing the limited slip unit to achieve the right preload. This allows the 850CSi to make use of its V12 power in any condition, including wet roads. When you retain oil consistently, churning losses will also be reduced to improve effective fuel economy and lower operating temperatures on extended highway runs. All BMW drivetrain tests demonstrate that a new Differential Seal minimizes power losses. When a BMW driver puts the 850CSi out of a hairpin, the Differential Seal maintains pressures that keep torque flowing without chatter. The component has a quality baseline that is as strict as BMW's; it suits the whole 8 Series halo and ensures longevity that matches the car's grand touring ethos. Few components do so much unseen work as this Differential Seal, which remains an outstanding performer in the market for its toughness, accurate fit and all model compatibility with the legendary BMW 850CSi. A small but essential hero of every 850CSi, still on the road.
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