The facts are there in that link...it leads to other forums and to the other sources of the information - if BMW 335i/135i owners know of and accept it, I think it should be good enough for you too
My rides: 2004 Opel/Bertone TS Astra turbo convertible - 2012 Mercedes Benz C204 C Class coupe
Others: 2009 Honda City VTiL sedan - 2015 Fiat 500