Hello all. I am loving my GS350 F-Sport awd so much after coming from a 2011 BMW 535i sedan. I just recently put on some decent Michelin Primacy MXM4 tires on the car which vastly improved the ride and handling balance for the F-Sport over the junk Bridgestone Turanzas. The car is smoother, quieter yet very sporty with minimal loss in handling feel. However, I have noticed that even before with the Bridgestones Turanzas and less so now with the Michelins , the car feels slightly twitchy at higher speed on highways and I have to do some adjustment in the steering to keep car in the lane. Its minimal and happens a few times on certain highways but I was curious as one review by "winding road" where they compared the A6 vs the GS they complained of twitchy steering at high speeds. Its not like a wandering feel. The car tracked straight very well and does not pull.

Is it the new electronic power steering programing? My alignment was checked out fine by the dealer and its not a major complaint of mines but I was hoping they will reveal an update for the EPS. It is nothing like the terrible pull to the right issue with the EPS on the new latest BMW 5 series.

 

Will switching to Sport or Sport+ mode tighten up the steering at high speed?

 

Switching to sport + does tighten up the steering and makes it more stable at higher speed but still in normal mode its an issue. Not sure if anyone else have noticed this on the highways with no crosswinds.