You mean Menz 3800 (4500) vs Rupes Diamond? I have both of them and I can say Rupes Diamond beat 4500 with easy. Diamond is so precious to me so that I will use them only in a very special car cause I only have 4 Oz. Bottle of them and haven't finish my 1000 ML bottle of 4500 yet. My next 1000 ML bottle will surely be diamond.