Upper cyl lube......another brand is Lucas. ( I think the Lucas is more popular tho ) .???
Recently told to use Castrol activ2, ...2 stroke oil. ( chap that told me should know, so I'm going to change over as soon as I exhaust my current stock )
About 100+ hrs ago, my pull throughs were "ordinary", so I had a topend rebuild done, properly done. ( read earlier post for details )
Anyway after 30....40hrs I noticed cyl variations, small, but apparent. Up till then I ran on nothing but avgas, ol mate told me to get onto upper cyl lube and run with that, within a fairly short time my pull throughs evened out, all were really good, so now I've accumulated 100+ hrs and everything is perfect.
Must add.....I've recently changed fuel to a cocktail...40% avgas, 60% premium 95, Am considering going full on 98, am hearing good reports, I'll continue with the oil as well.