My friend brought a norvel conversion over here and we "ran" it but it didn't run great and that was with Davis 1/2 a fuel not my low either BBB. The PAW .061 runs way better. I get 13,800 to 14k on a MAS 7x3 and it will run on my nasty BBB although it starts better with higher either.

If you want to keep carbon down try running straight 30 or 40wt motor oil. If you look at the specifications buy ones with the lowest ash content.