Honda CBF500/A Owner's Manual page 87

1. To drain the oil, remove the oil filler
cap/dipstick and crankcase drain plug (1)
and sealing washer (2).
(2)
(1) Oil drain plug
(2) Sealing washer
2. Remove the oil filter (3) with a filter wrench
and let the remaining oil drain out.
(1)
(3) Oil filter
(3)
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