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80w-90 Gear oil vs SAE90 extreme pressure gear oil

L

LonM

Member
Our New Holland manure spreader calls for 80W-90 gear oil to be used in one gearbox, and SAE90 extreme pressure oil in the other. What is the difference?

Thanks for any help!
Lon
 
Did they mention what class of oil to use? IMO that would be a lot more important than viscosity alone. GL-4 & GL-5 are the current classes, GL-1-3 might still be available in certain brands but these classes are out-dated now.

GL-4 and GL-5 both have EP additives, the number correlates to the amount of EP additives, higher class number = more EP additives. GL-4 and GL-5 are interchangeable in most applications. Most of the time when GL-4 is specified, its for gear boxes/transmissions with synchronizers or bronze/brass bushings. Too much EP additives can attack bronze/brass and cause wear. If no GL oil class is specified, it probably doesn't matter which you use. There is very little concernable difference in 80w-90 vs SAE-90. If classification is not specified I would just buy one viscosity for both (80w-90 in either GL-4 or 5)
 
Yes- the beater drive gearbox operates at
close to a 1:1 ratio, and calls for the
80w-90 GL5.

The apron drive gearbox is a worm gear
drive, with fairly high input speed and
very low speed output. That one calls for
the EP90. I hesitate to out GL5 in there
because it doesn't say either way...

Thank you

Lon
 
Yes, I am sorry for not including that
information, but the oil spec for the
beater drive gearbox is SAE80W-90 GL5.

The apron drive gearbox guideline just
says SAE90 EP, with no mention of what
class.

Thank you,

Lon
 
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