Looking for some guidance on my old-ish Cub Cadet lawn mower. It has the B&S 6.5 engine, does not have the words 'Intek" or "Vanguard". "Professional Plus," maybe. Oil is full, changed annually with whatever 5w30 or 10w30 is closest at hand. Probably QSGB right now, SL grade.
Before I start...