Ford 1998 Taurus User Manual download pdf (Page 159)

3.4L-32V V8 SHO engine

Your vehicle is

designed to use

“Premium” gasoline

with an (R+M)/2

octane rating of 91 or higher for optimum

performance. Gasolines with lower octane ratings

can be used, but performance may decrease. We do

not recommend the use of gasolines labeled as

“Premium” in high altitude areas that are sold with

octane ratings of less than 91.

Do not be concerned if your engine sometimes

knocks lightly. However, if it knocks heavily under

most driving conditions while you are using fuel with

the recommended octane rating, see your dealer or

a qualified service technician to prevent any engine

damage.

Fuel quality

If you are experiencing starting, rough idle or

hesitation driveability problems during a cold start,

try a different brand of gasoline. “Premium”

unleaded gasoline should not be used (particularly in

the United States) if “Regular” unleaded gasoline is

recommended because it may cause these problems

to become more pronounced. If the problems

persist, see your dealer or a qualified service

technician.

The American Automobile Manufacturers Association

(AAMA) issued a fuel specification to provide

information on high quality fuels that optimize the

performance of your vehicle. We recommend the use

of fuels that meet the AAMA specification if they are

available.

It should not be necessary to add any aftermarket

products to your fuel tank if you continue to use a

high-quality fuel.

(R+M)/2 METHOD

Maintenance and care

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Ford 1998 Taurus User Manual Page 159