Oceanside Auto Repair

BMW F80 M3: Rear Differential Mounts Replacement

The BMW F80 M3 was manufactured between 2014-2018 which featured an S55 twin-turbocharged straight-6 configuration engine, with 425 horsepower. With all that power and fun, comes more stress on other parts of your car. One common area of failure that we routinely encounter is the rear differential mounts.


Rear Differential Mounts Problem

The factory setup on the F80 M3 consists of a single, offset rear differential bushing and mount that holds the differential to the rear subframe. The OEM factory mount is a rubber bushing that contains fluid on the inside. Over time, these rubber mounts will begin to crack. Once cracking has begun, it can spread throughout the mount and result in more serious problems. We have seen failure in these F80 M3 rear differential mounts typically in the 30,000 – 50,000-mile range.

The Best Solution

The best solution that we have found to cure this common problem of rear differential mount failure is with Turner Motorsport’s, Dual Mount Differential Plate. We utilized this dual mount diff plate accompanied by two Urethane rear differential bushings off of a later model M3 (2018 and newer M3 models) for an OEM + feel that will be an overall great improvement without being too aggressive. Thankfully the rear subframe on the F80 M3 already has a second, empty hole that is the same size as the factory diff mount making it the perfect opportunity to add a second diff mount.

Result: High Performance Differential Mounts

Replacing the old worn bushing and mount, and adding a second differential mount, relieves the unnecessary stress of the factory setup. In addition, it provides an overall better, longer lasting, high performance mount. In our opinion, this repair and upgrade is an absolute necessity for any F80 M3. If you are curious about the current condition of your rear differential mounts on your F80 M3, or any BMW for that matter we offer a free courtesy inspection for every car that enters our facilities.

Schedule an Appointment or give us a call today to learn more! (760)721-5500″


BMW Service
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343 Airport Rd. Oceanside, CA 92058 (760) 721-5500