The reason for the oil draining into the sump is usually a worn oil pump,it can be reached by removeing the clutch cover then removeing the clutch , remove the oil pump disassemble and visually inspect the condition of the rotors if there is no obvious wear then measure the clearences between the inner and outer rotors to see if they are within specified limits.The oil pump is only available as a complete unit costing over £100 in the uk.
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