So check this out, I drained the Amsoil out for the regular service and popped on a new K&N then filled with 3.5 Mobil1 20/50. The engine noise from the top end almost doubles instantly between 2g3 and 3g rpm,,,,I had to ride to Lexington, about 100 miles north so let the HD mechanic listen to her while there. He indicated it seemed fine, and was normal in some twin cams to do that with one syn oil and not another. So like, where's my Amsoil,,,,
