Some info not so related to your question:
When I bought my 125TDI 3 year ago, I found out from the manual that the tyres (17") came with the car were not to be snow chained. I asked the dealer when I brought my car for service. They don't have much clues but they said if it states that in the manual then that's it. I need to have another set of 16" wheels for snow chains! Not sure if it was in the R36 manual (worse as you have 18" wheels!)
I went to the snow (1st time with that car) last month. The guy from a chain hiring place checked the clearance and say it's okay so I managed to get a chain hired.
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