Join Date: May 2013
Location: Nakhon Si, Thailand
Some change the oil every 1,000 miles, some every 10,000 miles, the bikes seem to keep running.
You can overdo it or you can neglect it, the engines will probably outlast the other parts of the bike.
Personally I try to stick to the manual.
current: CBR500R, CRF250M, MSX125, Yamaha Nouvo 135
previous: CB360, CB450SC (2), VT500FT, XS650 (3), Virago 750, Intruder 800, XJ600S, Intruder 1400, K75S (5), K100RS (5), ZX9R, KLR250, XR650L, DR650SE, Ninja 250, VTR250 (2), CBR150R (3), AX-1