Check Oil Level And Condition

Remove the filler plug and gasket.
Check that the oil level is just below the lower edge of the filler plug hole.
Check that the oil is not excessively foul and has moderate viscosity.

Fig 1: Identifying Drain And Filler Plug
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.
Install the filler plug and new gasket, then tighten them to the specified torque.
Tightening torque: 32 ± 2 N.m (24 ± 1 ft-lb)

Fig 2: Checking Transfer Oil Level
Courtesy of MITSUBISHI MOTOR SALES OF AMERICA.