I use Shell 40Wt. I tried Mobil One [synthetic] for a while, but the net result was less money in my pocket. I ran the same motor on the dyno with straight 40 Wt in the morning and Mobil One [synthetic]in the afternoon and the top speed was the same.
Congrats on the first 500 miles.
Whizzer OuterBanks,
Quenton