By the book oil change every 10,000 Km.s = 6,250 miles, on my Piaggio B V 350 2016 I change the oil around 4,000 miles , and never a low oil reading on the dip stick, lately I am using rotel T6 for engine and oil for tranny piaggio oil ( wet clutch, ) I am now at 24,514 Km.s , the scooter will be 2 years old, on the road old, Aug. 30 2019