Slick 50 was real popular in the 70's and early 80's. Nothing ever proved by it. If it worked, every race team in every sport would be using it, and no one does. However, they all DO use synthetic oil.
I always use Mobil 1 and blend it, 3qts Mobil1 & 2 qts regular oil. I raced my '67 Shelby GT500 on it, never an engine failure. Raced my Mustang GT on it, same results after 135K miles. My ZX11 Ninja, 87k miles, no problems, and my ZX9R Ninja, 60K, no problems. Both bikes have seen extensive track duty, running 11-12,000 RPM routinely.
Guess what's in my VX? Yup. Synthetic oil is all that has been used in every jet aircraft for the last 60 years. Also in every spacecraft ever launched. No additives.
Hey, that's just my 2 cents....Robert