Gappy
Tuned and Synch'ed
I am about to fill my 94 calli with engine oil. My owners manual says to use 10-40 synthetic, my question is, is it better to use a 20-50 or 60 synthetic? Or is everybody going by the book? My 83 HD Shovelhead calls for 20-50w but at the time the manual was printed , there was no 20-60w to be had and now I run 60w in that bike . Should I up the viscosity in my Guzzi?