I'm using Castrol RS. The screw cap is located on the right side
of the bike, above the round black thing which stores the engine
oil. It can be opened using a plier. but first u gotta drain it by
unscrewing a drain plug located on the left side below the engine
oil compartment. i think the size of the nut is 10. After draining,
screw back the drain plug. Then, as 4 me i pour in 750ml of engine
oil(4T) using a small funnel in to the engine oil cmpartment.
