2006 Suzuki SV 650 "formula engine slip" Questions

Engine Oil Greetings fellow SV owners. I've seen alot of debate on what oil you should use on the SV650S. I went to Walmart today to get some oil and the book specifically says SF 0r SG, although last

...formula of which I of course, as a senior citizen - has slipped from my mind. I can tell you pI pie) = 3.14 or 22/7. ... and you could determine the actual bore and stroke of each of the engines you ...