I just bought an 2009 X5 3.0 2 weeks ago. Came stock with 18" wheels. I bought a set of Y214 20" (replica wheels) with the correct tire sizes as per bmw catalogue.

However, something very weird is happening. Under normal driving, the DSC light starts blinking randomly and it seems to cut the throttle. This is happening under very normal straight line cruising speeds. It also happens randomly. It happened right after I swapped the stock 18" to aftermarket 20" wheels.

Any ideas what is going on?