Take the cap off the reservior.
Drain it.( take plug out of lower unit)
Take the vent plug out of the upper.
After it's done draining, insert the pump hose
into the drain hose in the lower, start pumping
the oil. ( takes somewhere around 2.5 to 3 qts
to reach the vent hole)
Once it starts flowing out the vent hole in the upper,
install the vent plug.
Continue pumping oil til you see oil starting to
come into the reservior.
Remove pump hose and install drain plug
back in the lower.....all in the same motion
Check the level in the reservior, once it's done
rising, go ahead and fill it as needed.
Install cap on reservior, job complete.