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* Heavy duty trailer towing with ambient temperatures above 50°F
(10°C) requires 15W-40 engine oil.
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 CI-4/SL
or CI-4 PLUS.
The center section of the API
symbol shows the SAE viscosity
grade.
Use a Ford engine oil filter, part number FL-1995 or equivalent. This
filter protects your engine by filtering harmful, abrasive or sludge
particles.
SAE VISCOSITY GRADES
EXPECTED TEMPERATURE RANGE
F˚ -20 -10 0 10 20 30 40
4035302520151050-5-10-15-20-25-30C˚
50 60 70 80 90 100
*
15W-40 Preferred
10W-30
5W-30
0W-30
Preferred
2006 F-650/750 (f67)
Supplement
USA (fus)
Maintenance and Specifications
180
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