Depends on the model
According to the 1999 Lincoln Continental Owner Guide : " premium " unleaded gasoline , 91 octane or higher
yes yes
That car is designed to use the regular leaded gasoline not the premium gas.
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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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The recommended fuel for all Volvo 70 series is premium, 91 RON or better.
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
As long as the 1999 has the 3.5L engine, yes.