Indy - correct on the location of the oil plug, thanks.the book will say to use SAE30 oil, but in the colder month I use 5w30 for easier starting. it takes just under 1 quart
The Subaru/Robin 6HP on the Centri actually takes right at 20-21 oz. I called PG yesterday and did an oil chg today and that is right on.
PG also gave me the Fram/Napa filter equavalents so I don't have to buy the OEM filter next time for more bucks.