The BMW M5 Differential Seal locks gear oil in and keeps debris out, protecting the rear driveline from contamination on street and track while maintaining power delivery. Installed at the nose of the rear differential, the Differential Seal holds the 75W-90 lubricant in order to keep the gears cool while wheels can spin at different speeds during corners. If not for this little barrier, pressure and heat would thin the oil, leaks would appear, and any diff in a BMW M5 could overheat within minutes of spirited driving. Crafted from advanced synthetic rubber, the Differential Seal is designed to withstand heat and flexibly bend to work in synchronization with the drive shaft. Thus, it can endure brutal launches in summer yet remain supple on a cold winter morning. Significantly, the same Differential Seal fits onto both the open and limited slip designs of every generation of the M5, as its job is all about containing fluids rather than transferring torque. The compatibility of the E28, E39, and the recent platform means owners can rest assured that the same beautifully crafted Differential Seal delivers the same reliability. The Differential Seal effectively prevents even the small seeping of fluid levels to enhance low viscosity and thus reduces friction, drivetrain noise, and improves efficiency that you can feel at the pedals. The additional role of protecting costly mechanisms enhances safety because a cooled and lubricated differential means increased predictability of tire grip when the M5 unleashes full power out of a bend. Visual inspections every 3,000 miles by the owner will alert them to the presence of a glaze or wetness about the Differential Seal. If the owner acts quickly, replacing it before it gets worse and wears out the expensive component. According to track enthusiasts, the BMW M5 Differential Seal can withstand repeated hard launches. Commuters love the quiet, vibration-free ride it allows. One ring raises all BMW M5s to their maximum potential. Similarly durable performance has long been a hallmark of BMW.
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