SAE 90 vs 75W-90 Is this OK???????? - Ford Powerstroke Diesel Forum
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post #1 of 3 Old 01-02-2012, 01:26 PM Thread Starter
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Question SAE 90 vs 75W-90 Is this OK????????

I am going to change the fluids in my front/rear differential and transfer case. I have looked in my manual for the proper viscosities and quantities. Question: My manual says to use SAE 90 in the front differential but I see folks seem to be using 75W-90. Is this acceptable and why? I have looked at several sites that reference using 75w-90 but none have indicated why this is OK?

Thanks for your help.

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post #2 of 3 Old 01-03-2012, 10:22 AM Thread Starter
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SAE 90 vs 75W-90



Anyone? Even a guess might be helpful. Thx

2004 F250 Lariat/6.0L/SRW/Crewcab/Shortbed FX4
EDGE Evolution CTS
Python 424 Remote Start
Volant Ram Air

RCD-EGR Delete
Cat/Muffler Delete
Rancho RS 5000 Shocks
6.4 Banjo Bolts
Throttle Plate Delete
4" Straight Pipe
Updated to "Blue" Fuel Pressure Spring
DIY Coolant Filter

Caterpillar EC-1 "RED"

"Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote." - Benjamin Franklin, 1759
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post #3 of 3 Old 01-03-2012, 11:46 AM
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75w90/80w90 ain't gonna make a bit of difference. Run what you want the differential won't care one bit.

1991 Ranger - 38" TSL's, 3 link, One tons, 5.38s on King air shocks....under construction.
1997 Ranger - reg cab flare side, 3.0L, M5OD-R1, 4x4, 31x10.50r15 MT's.
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