BMW E39 vibration at 90-120 km/h: rear subframe and subframe bushings
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BMW E39 vibrates at 90-120 km/h, what causes it?
The most common cause is worn rear subframe (rear carrier) and subframe bushings, i.e. rubber mounts. Replacing them has removed the vibration completely or mostly, and the rear end feels tighter after the replacement.
How do I check the E39 subframe bushings?
Remove one of the bushing's four 21 mm bolts at a time and look at the condition of the rubber. Cracks mean replacement. The condition only shows once the bolt is removed. Check the tyres and brake discs first: replacing the bushings is not worth it if the tyres are not true.
What else can cause the same vibration in an E39?
Unevenly worn tyres, spacers fitted under the wheels, worn rear shock absorbers, squeaking bushings, and the driveshaft centre support bearing and joints. Rear shock absorbers can look good in a shock test even if they are worn when removed.
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