I think I found a new oil for JButchs old turbo Subaru. Shell Rotella T6 5W40 is well known in the Subaru crowd but the only thing is that Shell will openly admit its not for gas engines and its bad for the cats. T6 5W40 produces great results on the Blackstone report. Shell has now upped the ante with low saps API SN rated 0W40 version! So the JButch need not worry if the old Subaru going to lose a cat.