It's my understanding that all the Mobil 1 oil have been reformulated with an SL API rating as well as going to the SuperSynthetic formula. I understand the SuperSynthetic is much better. However, with the changes made concerning the new SL API rating, the Phosphorus and Zinc levels have supposedly been lowered in the 15W-50 making it less desirable for motorcycle use. I would really like to run this oil but am still concerned since my bike sees WOT nearly everytime I ride it. There is a lot of debate in the motorcycle forum I frequent about the use of this specific oil and weight. Most agree it is safe to use. Most also agree that it does not have moly in it. My concern that the recent changes negate their opinions which may now be outdated. Someone please clear this up for me.