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According to the 1999 Lincoln Navigator Owner Guide :

It depends on which engine you have :

The 5.4 liter ( 2 valve per engine cylinder ) uses " regular " unleaded gasoline , 87 octane

The 5.4 liter ( 4 valve per engine cylinder ) takes " premium " unleaded gasoline , 91 octane

* there should be a Premium Fuel Required / Recommended sticker inside the fuel filler door

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Q: What kind of gas to put in a 1999 Lincoln Navigator?
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