A hybrid drive module, comprising a housing (170) enclosing a chain drive (120) connecting an electrical motor (110) with a crank shaft (22) of an associated internal combustion engine (20) via at least one coupling (130, 140). Said housing (170) further comprises a reservoir (190) having an inlet (212) configured to receive oil from the chain (126) during operation, and an outlet (214, 214′) arranged to distribute oil back to the chain (126).