One more comment...If your going to be running the engine on a regular basis...I've seen it suggested you don't really need an after run oil with the quality and additives in todays fuels...

I rely on Ultra Oil primarily because most of my engines will be sitting a while before the aircraft are built...And since I re-building most all of my engines I'm using it as an "assembly lube"...

Once I get some plaines in the air and am flying on a regular basis I plan to cut back on the after run oil...

Just My .02

Chuck