fuel additives FORD SUPER DUTY 2003 1.G Owners Manual

3. Recheck the engine oil level. Make sure the oil level is not above the
MAX mark on the engine oil level indicator (dipstick).
4. Install the indicator and ensure it is fullyseated.
5. Fullyinstall the engine oil filler cap byturning the filler cap clockwise
1/4 of a turn until three clicks are heard or until the cap is fullyseated.
To avoid possible oil loss, DO NOT operate the vehicle with the
engine oil level indicator and/or the engine oil filler cap removed.
Engine oil and filter recommendations
Look for this certification
trademark.
SAE 5W-20 engine oil is recommended.
Onlyuse oils “Certified For Gasoline Engines” bythe American
Petroleum Institute (API). Use Motorcraft or an equivalent oil meeting
Ford specification WSS-M2C153–H.SAE 5W-20 oil provides optimum
fuel economy and durability performance meeting all
requirements for your vehicle’s engine.
Do not use supplemental engine oil additives, oil treatments or engine
treatments. Theyare unnecessaryand could, under certain conditions,
lead to engine damage which is not covered byyour warranty.
Change your engine oil and filter according to the appropriate schedule
listed in the scheduled maintenance guide.
Ford production and aftermarket (Motorcraft) oil filters are designed for
added engine protection and long life. If a replacement oil filter is used
that does not meet Ford material and design specifications, start-up
engine noises or knock maybe experienced.
It is recommended you use the appropriate Motorcraft oil filter (or
another brand meeting Ford specifications) for your engine application.
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196

be void for any damage to the fuel tank or fuel system if the
correct genuine Ford or Motorcraft fuel filler cap is not used.
The fuel system may be under pressure. If the fuel filler cap is
venting vapor or if you hear a hissing sound, wait until it stops
before completelyremoving the fuel filler cap. Otherwise, fuel may
sprayout and injure you or others.
If you do not use the proper fuel filler cap, excessive pressure or
vacuum in the fuel tank maydamage the fuel system or cause
the fuel cap to disengage in a collision, which mayresult in possible
personal injury.
Choosing the right fuel
Use onlyUNLEADED FUEL. The use of leaded fuel is prohibited bylaw
and could damage your vehicle.
Do not use fuel containing methanol. It can damage critical fuel system
components.
Your vehicle was not designed to use fuel or fuel additives with metallic
compounds, including manganese-based compounds containing MMT.
Repairs to correct the effects of using a fuel for which your vehicle was
not designed maynot be covered byyour warranty.
Octane recommendations
Your vehicle is designed to use
“Regular” unleaded gasoline with
pump (R+M)/2 octane rating of 87.
We do not recommend the use of
gasolines labeled as “Regular” that
are sold with octane ratings of 86 or lower in high altitude areas.
Do not be concerned if your engine sometimes knocks lightly. However, if
it knocks heavilyunder most driving conditions while you are using fuel
with the recommended octane rating, see your dealer or a qualified
service technician to prevent anyengine damage.
Fuel quality
If you are experiencing starting, rough idle or hesitation driveability
problems during a cold start, trya different brand of “Regular” unleaded
gasoline. “Premium” unleaded gasoline is not recommended (particularly
87(R+M)/2 METHOD
Maintenance and Specifications
208