Schaeffer Oil V-Twin Lube Primary Synthetic Plus

After years of recommending the same transmission fluid for the Spec Miata 5 speed transmission, Advanced Autosports has "shifted gears" and is now running a product from Schaeffer oil. Originally designed as a lubricant for Harley Davidson motorcycles, their "V-Twin Primary Case Lube" works better than anything I have found for the Miata transmission. The Primary case on a H-D trans is a multi-disc wet clutch system. Being a wet clutch, the fluid must provide lubrication and cooling to the chains, bearings, gears etc. While at the same time, not acting as a lubricant to the clutch discs. The Miata's brass syncro rings are similar in operation to the clutch discs on the H-D motorcycle. Advanced Autosports has been testing this fluid since last summer. I have torn down multiple gear boxes after using the Schaeffer V-Twin Primary Lube and found reduced wear on shift forks as well as the brass syncro rings.  The fluid has a different feel that is hard to explain. Very smooth and slippery