Denis_E55

2015 S550 4Matic. 75K Miles. The vehicle sways a ton when going over cracks/bumps in the road or over manhole covers, very noticeable in COMFORT mode, little better in SPORT Mode. Any ideas where I should start? Are the suspension bushings on these cars known to go bad?

Denis Osullivan

I bet your using RunFlat Tires in the rear.

Denis_E55

I just bought this car, how can I tell if they're RunFlats?

Denis Osullivan

You should see some type of wording stating they are RFT depending on the manufacturer. I believe Continental’s say MOE. Others can chime in on the wording.
I had RFT and experienced the same harsh bumping ride. I changed to regular tires and the ride is so much better!