5th and 6th Gen Maintenance and Repair
I know the 2010 SHO uses 5W-20. For some reason, Ford switched to 5W-30 on the 2012 SHO (and maybe 2011). I wonder why and, if 2010 owners should go to 5W-30.
I have also heard (a few years ago) that when switching from conventional oil to synthetic, guys went from 20 to 30.