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What oil to use in rear-diff?

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Old 12-02-13, 08:32 AM   #31
4TehNguyen
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heres crush washers for an 06 IS350, Part #: 1215710010. Its probably the same thing

http://is.sewellparts.com/accessorie...2006/1903.html
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Old 07-29-14, 05:40 PM   #32
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Just changed the rear diff fluid on a 2011 ISF at 29,900 miles. Replaced it with Redline 75W-90 GL5 rating.

The magnet on the drain plug had a nice gooey layer of shavings, and the diff fluid color was a little bit dark red going on black.

If you drive hard and power out of corners a lot (ISFs with torsen LSD,) I would recommend changing it at 30k or earlier. I think changing it at 60k is a little too long.
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Old 07-29-14, 06:24 PM   #33
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how does one 'inspect' the rear differential oil to know it needs a changin'?

is it a tricky change out?
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Old 07-30-14, 05:50 AM   #34
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Quote:
Originally Posted by scamsel View Post
how does one 'inspect' the rear differential oil to know it needs a changin'?

is it a tricky change out?
Don't bother inspecting it. If you know you have been rough with the car or have 40000miles on it, replace it. This is for 2008 to 2009. I think the diff with LSD (2010-2014) requires replacing earlier. It's an easy job, drain from the bottom and fill on top until the fill hole spills over. Keep in mind, the fluids for non lsd and with are different.
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Old 07-30-14, 05:52 AM   #35
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make sure you open fill port first, you dont want to drain it first and find out you cant open the fill port for whatever reason. General statement for changing fluids. You can get Mobil1/Valvoline 75W-90 synthetic diff oil for $10/qt
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Old 07-30-14, 06:51 PM   #36
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Quote:
Originally Posted by Compthis View Post
...Keep in mind, the fluids for non lsd and with are different.
Not true. Torsen units use the same oil as an open diff. Any GL-5 is fine for either of them. It's the clutch type units that use a different oil.
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Old 07-30-14, 08:25 PM   #37
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Quote:
Originally Posted by lobuxracer View Post
Not true. Torsen units use the same oil as an open diff. Any GL-5 is fine for either of them. It's the clutch type units that use a different oil.
I could be wrong but i thought the part number for the 2008 and 2010 diff fluid is different.
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Old 07-31-14, 05:29 AM   #38
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Somebody is trying to make you pay more for than you need. Any GL-5 gear oil is sufficient. Even the weight isn't a big deal for street applications. If you are tracking or drag racing, then you might want to consider a premium oil designed for shock loads, but for normal street use, it's not a big deal at all.
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