Hey Glider - Don't know if you get H-D's "Enthusiast" magazine, but in the Fall 2007 issue on page 10, there's an article entitled, "Straight Talk about Syn3." Typical interview type of article which, in a nutshell, tries to sell that H-D brand of oil stating it has been developed and tested exclusively for all 3-holes in a Harley. Think I will continue to stick to Mobile1 V-Twin 20w50 in the crankcase, Mobile1 75w90 Gear Oil in the trans and H-D Formula+ in the primary. Just makes better sense to me.