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.
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