The drain plug is a 14 mm hex. must have one of these to change the oil.
I also add zinc to the oil - can be purchased at most auto parts stores.
like uncle Rick - I too wait to change the o-ring gasket for the filter. I believe the NAPA filter has the correct o-ring. once the filter is replaced and engine started - make sure there are no leaks - if a leak occurs - most likely the canister is not fully in place. this is an easy mistake to make.
use a new copper gasket for the drain plug - or use hylomar to seal the oil copper gasket.
Reed, quit lurking and lend your support. I haven't needed a councilor yet like the other banishment.