Best differential fluid to use?
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Instructor
Joined: Jan 2013
Posts: 886
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From: MN
Best differential fluid to use?
Going to change mine as it makes a whistling noise between 30 and 40 mph when it's cold, I don't think it's ever been changed.. What is a good brand and what is the proper viscosity I should use, and yes I searched, but got too many different opinions. Thanks in advance!
Just use any syn gear oil 75/80W. The first time I did this job, I used dino gear oil. Then I realized it was just a pain in the azz to do, so I paid a local quick xpress lube shop to do it for me. Used Havoline syn gear oil this time. I won't think about touching it again for at least 60k
Lexus Champion
Joined: Dec 2008
Posts: 1,714
Likes: 22
From: VA
mobile 1 synthetic 75/90. Pep boys and autozone both have a pump and hose that fits on the quart jug to pump it in the diffy fill bolt. Be sure to get a couple crush washers for drain and fill bolts. Undo fill bolt first. You can even get new drain and fill bolts because if they have not been torqued since 99 you may have an issue getting them a loose right there.
mobile 1 synthetic 75/90. Pep boys and autozone both have a pump and hose that fits on the quart jug to pump it in the diffy fill bolt. Be sure to get a couple crush washers for drain and fill bolts. Undo fill bolt first. You can even get new drain and fill bolts because if they have not been torqued since 99 you may have an issue getting them a loose right there.
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