Before you do PM Uncle Bob or the guys at 1320straightliners, they are a wealth of info, nice guys and have a lot more experience than me. I have only used BB turbos and would hate to see yours sieze if it requires more oil.Ross, I think I will have to go with a ristrictor as well, I am still having the problem, though my turbo is not dual bb, it a journal bearing,
Cheers
Ross