Originally Posted By: LotI
Originally Posted By: OVERKILL
As others have said, run it as is. It is on the lighter end of the 40 weight spectrum.
I feel offended by you using the term "weight" when referring to oil.
The preferred nomenclature is grade, please
Better tell Ford you don't like them using it either:
https://www.fordparts.com/Products/Chemicals-MotorOils.aspx
Originally Posted By: Ford
Motorcraft® SAE 30 Super Duty® Diesel Motor Oil
High-quality motor oil for older-model Ford diesel vehicles
For light- and heavy-duty diesel engine applications
Recommended for use in Ford vehicles equipped with diesel engines prior to 1995 model year
Specially formulated for engines requiring a high-quality single-weight oil and operated with an engine block heater or in outside temperatures no lower than 10°F (-12°C)
Recommended by Ford Motor Company
Available in one-quart bottles