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post #1 of 8 (permalink) Old 10-03-2013, 11:24 PM Thread Starter
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Rear differential fluid leaving me puzzled

I have a 2004 Nissan Pathfinder Armada LE 4x2 and it's been a long while since the differential fluid has been changed and I am looking to do it myself. However, I am confused on which weight oil I need. My manual says 80W-90, Nissan tried to sell me 75W-140. I did quite a bit of reading online and I am seeing 75W-90 tossed around quite a bit. I live in sunny Southern California (Never drops below ~20F) and have no idea which fluid to go for. Anybody have any information that would help me out?

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post #2 of 8 (permalink) Old 10-03-2013, 11:35 PM
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80W-90 will be OK. However, if you tow any or make long drives in hot weather I would use 75W-140.
Nissan has changed the specs for the Titans to 75W-140. I use Amsoil synthetic 75W-140 in my Armada. It gives you added protection under harsh conditions.
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post #3 of 8 (permalink) Old 10-03-2013, 11:58 PM Thread Starter
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Thanks for the information. Is there any downside to the 75W-140?

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post #4 of 8 (permalink) Old 10-04-2013, 12:09 AM
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i used 80W90 synthetic amsoil for the front and 75w140 synthetic amsoil for the rear. im in san diego. no issue at all.


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post #5 of 8 (permalink) Old 10-04-2013, 12:44 AM
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75w-140 is good for you guys in the southern climates.
Us northerners that have the snow and ice use the 75w-90.
Kind of hard on the diff gears when it's 0-20 below with the thicker lube.


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post #6 of 8 (permalink) Old 10-04-2013, 12:57 AM Thread Starter
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Looks like I'm going with 75W-140. Thanks for the help guys!

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post #7 of 8 (permalink) Old 10-04-2013, 06:52 AM
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At cold temperature, both oils are at the same viscosity. If you want to increase viscosity at colder temperatures, you should choose an oil with a higher "w" grade like 80wXX,85wXX etc.


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post #8 of 8 (permalink) Old 11-27-2013, 09:38 PM
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The lower weight fluid is for a no load, easy driven car. The original gears through the 2007 model year were un-heat treated Dana gears made in Mexico. Most of those have failed and been replaced. Nissan mandated the use of the higher weight oil to try and extend the lfe of the gears. It didn't work, but in the later, correctly manufactured gears, the 85-140 makes a huge difference. With proper maintenance, and synthetic fluid, both diffs should almost completely stop depositing metal residue on the magnets by 30k miles. If you hit 65k, and change the diff fluids at 15k mile intervals, and get between 1/2 pea and a whole pea sized metal deposit on the magnets, you have a bad set of gears and the unit is on the way out.
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