The BMW 335i Differential allows each rear wheel to rotate at a different speed so the car turns and maintains traction. Inside the BMW Differential is a ring gear, pinion, and side gears in which the engine's torque is split between the drive wheels. Early 335i models incorporate a traditional open Differential, which gives both wheels the same power. This is great on dry pavement but allows a tire to spin uselessly if it hits ice. Later 335i cars got an optional BMW limited-slip unit with clutch packs and spring preload so the better-handling wheel can receive additional torque, a definite handling boost over the open style. The main difference is a torque bias as the open design will split power 50:50 all the time while the limited-slip Differential can adjust the split and keep the acceleration steady if one side of the vehicle loses traction. No matter what type, proper gear oil ensures the Differential is cool and quiet, and ignoring rumbling noises risks ring and pinion damage. Owners of the BMW 335i should check fluid every 3,000 miles as the assembly can experience wear and tear including a dry Differential or worn U-joints in the driveshaft, causing the assembly to grind and rattle.
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