Ford 1997 Aerostar Manual page 234

Engine oil dipstick
6. Carefully pull the dipstick out again. If the
oil level is below the "ADD 1 QT" line, add
engine oil as necessary. If the oil level is
beyond the letter "F" in Full, engine damage
or high oil consumption may occur and
some oil must be removed from the engine.
7. Put the dipstick back in and make sure it is
fully seated.
Adding engine oil
It may be necessary to add some oil between oil
changes. Make sure you use a CERTIFIED
engine oil of the preferred viscosity. Your
vehicle's warranty coverage may not apply if
engine damage is caused by the use of improper
engine oil.
Add engine oil through the oil filler cap
highlighted in yellow. To add oil, remove the
filler cap and use a funnel to pour oil into the
opening. Be careful not to overfill the engine.
Recheck the oil level after you finish adding oil.
Engine Oil and Filter Changes
Change your engine oil and oil filter according
to these mileage and time requirements,
whichever occurs first.
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