Ford F-650 2001 Owner's Manual page 162

Maintenance and care
F˚
C˚
EXPECTED TEMPERATURE RANGE
Using the chart, determine which SAE viscosity grade best suits the
temperature range in which you expect to operate your vehicle. The use
of the correct oil viscosity grade for diesel engines is important for
satisfactory engine operation.
A symbol has been developed by the American Petroleum Institute (API)
to help you select the proper engine oil. The symbol will be included on
the oil container you purchase.
The top section of the symbol shows
the API service category
designation. This should be CH-4/SJ.
The center section of the API symbol
shows the SAE viscosity grade.
The lower section of the API symbol
will state energy conserving if the engine oil has been proven to have
fuel savings capabilities.
Use a Ford engine oil filter, part number FL-1995 or equivalent. This filter
protects your engine by filtering harmful, abrasive or sludge particles.
162
SAE VISCOSITY GRADES
*
Preferred
5W-30
0W-30
-20 -10 0 10 20 30 40
-30 -25 -20 -15 -10
15W-40 Preferred
10W-30
50 60 70 80 90 100
-5 0 5 10 15 20 25 30 35 40
SAE
15W-40