Easily repaired with 3 o-rings. Assuming this is a Saf-Air P5000 drain valve (from looking at the picture, 1/2 NPT threads), it takes 2x MS28775-011, and 1x MS28775-012. Look here for more info:
Saf-Air is is an aviation supplier for replacement o-rings for both fuel and oil drain valves. Our o-ring chart helps you find the correct size o-ring.
www.saf-air.com
Remove one retaining ring to open up the valve....change o-rings...re-assemble.
But, I've come to understand that for the 15yrs that I flew the RV9, every oil change included the whole tool cart for a full FWF inspection. I never took anything "quick" about an oil change. Lives other than my own depended on it. The RV8 just has a plug. It is my personal reminder to get out a wrench.
Yeah, I'll pile on the Fumoto recommendation. I have a Saf-Air on one airplane and Fumoto's on the other two. Never a drip from the Fumoto's but the Saf-Air has always dripped, and has dripped shortly after new o-rings were installed. It's going to be replaced with another Fumoto. I'm tired of the Saf-Air drips.