I've also read somewhere lately that it is not allowed to drive larger than 18 inches wheels with the 520d Efficient Dynamics, because then the promised exhaust gas and consumption values can not be maintained, well the consumption values do not work synonymous with 17 inches all. : D

Google could not help me.

My question is in how far everything is true, because I would like to drive 20 inches in the summer

you don't have a sticker on the front driver pillar? there should be mentioned what kind of wheels are you allowed.

the 20' would add unsprung weight, therefore you'd get a higher fuel consumption and obviously you'd pollute more by emitting more CO2 , it is true what they say when it comes to this aspect, however, if you can't be bothered by that then go ahead and get your 20" wheels

i have the same problem with a e90 320d effdyn.

on sticker i have only 16`

i buyed the car with 18`...i don`t have any problems with that

i don`t know if the police have some problem with me

But stands 17 inches I may drive, but somehow must be possible to register otherwise I have problems with the police and tĂźv :bashwall: