Fuel grade for 2006 Z4 3.0si

91 is typical USA grade, we don’t have that in the UK not Europe
 
I'm sure the handbook for my 3.0Si recommended a minimum of 98 RON whenever possible so I always tried to use 99 RON unless I couldn't find any.

But US fuel grades are different to European ones so I'd recommend looking in the book, or the back of the fuel filler flap.
 
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