Is fuel 91 octane can cause any damage to 2015 mustang 3.7L engine instead of 87 octane recommended?
no !!!! its the other way around...
No, in fact it might have liked getting some of the good stuff, it just means that do not go lower than 87 octane rating.
Thx a lot Kelly and Tennis man!!! very useful
Looking for a Used Mustang in your area?
CarGurus has 41,445 nationwide Mustang listings starting at $900.
Search Ford Mustang Questions
Ford Mustang Experts