F-Super Duty vehicles (6.4L engine):
•
An engine block heater must be used at temperatures below
–10°F (–23°C).
•
Use the same engine oil and filter change intervals when using
synthetic engine oil.
•
Heavier SAE 15W–40 and SAE 5W–40 engine oils are
recommended for temperature over 50°F (10°C) and must be
used for heavy duty driving and trailer towing.
A symbol has been developed by the
American Petroleum Institute (API)
to help you select the proper engine
oil. It will be included on the oil
container you purchase. The top
section of the symbol shows the oil
performance by the API designation.
This should match the owner guide recommendation. The center section
will show the SAE viscosity grade
2009 Econoline
(eco)
Supplement, 1st Printing
USA
(fus)
Maintenance and Specifications
46