FORD 2011 Mustang v.1 - Manual (Page 336)

Reset your Intelligent Oil Life Monitor™ after each engine oil and filter
change; refer to the Instrument Cluster chapter (except Shelby
௡
GT500
௡ which does not have this feature).
Exclusive use of E85 (Flex Fuel Vehicles only)
Every oil change interval – If ran exclusively on E85, fill the fuel tank full with
regular unleaded fuel.
Scheduled Maintenance Guide
336
2011 05+ Mustang (197)
Owners Guide, 1st Printing
USA (fus)