Other candidate that would be neat to see, is Berryman's B-12 CHEMTOOL

Though it's no longer bottled as a crankcase use, I've read, and also confirmed from Berryman themself that it is safe, as long as you add no more than half the bottle to the crankcase. The big issue though, is it has no measuring device, and it's a steel can...so a lot of people were overdosing and causing problems, so they took those directions off the can :X