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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 ) takes ( " 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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What gas should you use for your 1998 navigator?
According to the 1998 Lincoln Navigator Owner Guide : ( " regular " unleaded gasoline , 87 octane )
What grade of oil does 1999 Lincoln navigator use?
According to the 1999 Lincoln Navigator Owner Guide ( 5W-30 )
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What kind of gas should you use?
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