From a YZ250F service manual >
Use 10w40 motor oil in the gear box. Don't use any synthetic oils, oil marked "EC", or oil with "special" additives. Stick with the major brands; Pennzoil, Quaker State, Mobil or Shell.
Looking to see how much oil a YZ250F holds, and - f9a1134.gifsrc="/uploads/images/f9a1134.gif" alt="f9a1134.gif" class="h_mi" />
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