The original recommendation was EP Gear Oil conforming to
Ford specification M-4864-A and B, SAE 80 below +32 degrees F, and SAE 90
above +32 degrees F. (Do you want to change your hydraulic fluid every
spring and fall? ) However, the new recommendation from the local Ford-New
Holland dealer now recommends Ambra Multi-G 134 (NH-410B) synthetic fluid.
Some people stick with the original spec and use 90w mineral oil. The
modern equivalent of 90w mineral oil is TSC Traveler brand GL-1 or NAPA
part number 65-205. Those may be less expensive, but the Multi-G 134
synthetic is good from -5 to 120 degrees F. CNH sells a product called
Ambra 134D that conforms to that specification. The equivalent product
(and less expensive) from TSC that meets Ford spec M2C-134d is their
Universal Tractor Fluid. Neither of these products are SAE 90 gear oil -
they are multi-purpose oils with an exceptionally high viscosity index
engineered specifically for this type of application. The TSC product
labeled "Ford Tractor Oil" is a plain SAE 90 gear oil. Because of its much higher viscosity
index it doesn't thicken nearly as much when cold which makes it a better
performer in winter conditions. I use the TSC UTF product year
round in all my 8N's.
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