For many years, decades actually, I used nothing but NGK cooper, or Borch cooper and silver plugs because many have said platinum plugs are not as good. Couple years ago I tried a set of Borch Platinum +4 in my Porsche 944 and I was so impressed that I also put a set into my 928. A few months ago I decided to do the same with my 84' 500SEL. The Platinum +4 replaced a set of almost new NGK cooper plugs and once again they impressed. I have always heard that older Mercedes runs terrible with platinum plugs but it is not true in my case.