My thinking is that is would shear thinner.
After mucho age, heat, and use, it would thicken.
This is what happens to engine oil.
After mucho age, heat, and use, it would thicken.
This is what happens to engine oil.
Gear oil in axel does it get thinner or thicker?
- Thread starter Bluestream
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Shears then as mechtech says the oxidation starts to sludge it up. I've seen it come out in chunks before on severely abused equipment...needless to say it smells AWESOME!
I am now reconsidering 75w-140 for both of my rear diffs on my 97 ford explorer 5.0 AWD XLT and my 93 explorer Eddie Bauer Edition 4.0 V6 4WD.I am in the northeast and was just concerned with the frigid temps and my diffs. I at times haul a lot of tools, home improvement supplies, via sustained hwy speeds@130 miles per a day. Do these 8.8 or dana 35 axles really heat up when one travels in deep heavy wet snow? Is it true that ford stop using 75w-90 from the factory? I looked up pour point flows for Mobil 1 75w90 and 75w-140, and found the 75-140 to be -51 and the 75w-90 to be -46 degrees, what say you. My 93 has 167,000 original miles and my 97 5.0 has 123,000 original miles. How far would the 75w-140 shear down in say 10,000 miles? Thanks in advance!
The last time I "tested" a 75W140 after substantial use it was in the top range of a 110. Ford's current factory fill is a 75W140. I doubt you'd see less than a 3% mileage difference between a 90 and a 140 so if it is a vehicle that you want to keep and you put it under load regularly using a 140 is prudent.
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