Owner's Manual
Page 242
... recommended that you use the proper fuel cap, the pressure in the fuel tank can damage the engine. However, see your fuel cap with an aftermarket fuel filler cap, the customer warranty may not apply if your vehicle is designed to operate on premium fuel with octane ratings of less than... an octane rating of 91 or higher. Octane recommendations The 4.6L engine is damaged because you used if necessary. Typical octane rating label In some parts of the country, "premium" grade fuels are sold with an octane rating of 91 or higher. Using leaded fuel is recommended. /!\ WARNING If you ...
... recommended that you use the proper fuel cap, the pressure in the fuel tank can damage the engine. However, see your fuel cap with an aftermarket fuel filler cap, the customer warranty may not apply if your vehicle is designed to operate on premium fuel with octane ratings of less than... an octane rating of 91 or higher. Octane recommendations The 4.6L engine is damaged because you used if necessary. Typical octane rating label In some parts of the country, "premium" grade fuels are sold with an octane rating of 91 or higher. Using leaded fuel is recommended. /!\ WARNING If you ...