Ford F650 Owner's Manual page 228

Maintenance and Specifications
Component
Meritor -
single-speed
axle
228
Lubrication
type
Fill at the
factory with
Synthetic SAE
75W-90, will
have a tag
attached to fill
plug that reads
as follows:
"Filled with
synthetic lube.
Do not mix."
Multipurpose EP
gear lube of API
GL-5 quality
meeting
MIL-PRF-2105E
specifications
including
synthetic
lubricants. Do
not mix
conventional
and synthetic
lubricants.
Viscosity /
Ambient
temperature /
Notes
—
SAE 75W-140:
Above –40°F
(Above –40°C)
SAE 85W-140:
above 10°F
(–12°C)
SAE 85W-140:
above –15°F
(–26.1°C)
SAE 80W-90:
above –15°F
(–26.1°C)
SAE 75W
maximum
outside
temperature
(35°F (1.6°C);
Above –40°F
(–40°C)
Equivalent
Ford part
name / number
—
Motorcraft SAE
75W-140 High
Performance
Rear Axle
Lubricant /
XY-75W140-QL
Motorcraft SAE
80W-90
Premium Rear
Axle Lubricant /
XY-80W90-QL
Motorcraft SAE
75W-90 Fuel
Efficient High
Performance
Axle Lubricant /
XY-75W90-FEHP