Yamaha have put together a convenient kit, available in both semi-synthetic and full synthetic formulas, with a choice of three oil viscosities to suit your riding conditions. Each kit contains two litres of Yamalube oil (in a choice of viscosities) and all the Genuine Yamaha parts needed to complete an oil and filter change.
YLU-4S20W-50-2L (20w50 Semi-Synthetic), $55.23
YLU-4S10W-40-2L (10w40 Semi-Synthetic), $55.23
YLU-4S10W-40-YZ (10w40 Semi-Synthetic, 2010-2012 YZ450F Only), $52.89
YLU-4FS10-40-2L (10w40 Full Synthetic), $63.32
YLU-4FS15-50-2L (15w50 Full Synthetic), $63.32
Oil change kits will fit 2003-2012 YZ250F, YZ450F, WR250F and WR450F.