The blowers got a drain plug on the bottom.
A fill plug on the top.
And a plug on the side.
Warm her up, drain the oil, put the bottom plug back in

Fill her up until oil comes out of the side plug.
Job done

I use an oil can with a flexi hose to get at the fill plug.
Order your blower oil from woodbridge.
I change the blower oil every 500 hrs. Also the water pump oil at 500 hrs.
grease the blower every 100 hrs
Change engine oil every 50 hrs, oil and filter every 100 hrs
Clean out header tank filter every 100 hrs
Air filter and spark plugs every 500 hrs
Service it well and it will serve you well

regards
Chris