I remember the issue with the screen in Scoobies clogging up and starving the turbo. The OEM rolled back to a 3,750 OCI to "solve" the issue. Fail Subbie!
I recall a high end performance Evolution shop that had failures with their turbos using regular Mobil 1 due to low levels of ZDDP. I'm trying to find their article about it, but still looking.
Edit: found it
FP Turbo failures
Summary, Mobil 1 may be fine for your grocery getter, but it fails under heavy demand.
2014 Mustang GT custom ordered to replace the GT500: Sterling Gray, NAV, Recaros, Brembos, Glass Roof, back up camera, 6 speed auto, loaded
2012 Focus Titanium - 18" wheels with handling package
2009 GT500 Shelby (700 rwhp) - sold