After a long discussion of Mobil 1 at our usual coffee shop this am, I called Mobil Tech Line to get the "straight story" on Super Syn (which is an anti wear additive). This "evolution" of Mobil 1 IS our substitute for the factory fill which is called Mobil 1 Tri Synthetic (which they are no longer making). The gentleman told me to check the Exxon Mobil Chemicals website for more info, if needed. Sorry that I couldn't find the thread that someone started on this a couple of weeks ago.