Wheels/Tyres when slow turning creates a severe bumping on full lock. Either reversing or forward the sensation of moving over and off blocks. Dealership says it is a cold damp weather issue and to help gchange tyres to all weather product.
Any similar ideas or issues?
Wow! The same thing happened to me this week to my 2021 GLE 450. I was doing a full-lock left-hand U-turn in a parking lot and the front end started rocking like I was going over a series of speed bumps. It seemed to clear until yesterday when I felt something similar, again while turning sharp left in a parking left. I have an appointment with MB in about 3 weeks and will report back if they find anything.
My guess: the viscous coupler in the left wheel was not operating properly at the time.
Note: In all-wheel drive systems, viscous couplers allow the inboard wheel on a tight turn to “slip” in order to allow time for the outboard wheel to "catch up” (on its longer arc of travel) with the inboard wheel. This is why owners of 4-wheel drive vehicles (not all-wheel drive) are warned not to use 4-wheel drive on dry, hard surfaces, because 4-wheel drive systems do not have viscous couplers. The first time I made a sharp turn on pavement with my Jeep in 4-wheel drive, I felt and heard the inboard tire grabbing and “chirping” as it struggled to hold back for the outboard wheel to catch up.
I don’t understand the logic your dealer is using when blaming the tires.