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Old 02-25-2012, 12:34 PM   #1 (permalink)
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Default Differential oil change

I have a 2011 GV 2,4 with 12000 km. I have checked the manual and it says differential oil should be changed at 12k. I wonder if it is correct, and if so, it is just the rear diff or also the front diff and transfer case.

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Old 02-25-2012, 02:00 PM   #2 (permalink)
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Yes, the owner's manual is correct. The 12K km should be considered the "break-in period". Do both front and rear differentials. Although the owner's manual may not call for the transfer/extension case to be changed at 12K kms, I'd probably do it at the same time. It doesn't take much oil and if the tech is under there anyway, it won't add much to the job. Be aware, the diffs and transfer case take different oils. The differential needs GL-5 Gear Oil and the transfer/extension needs GL-4. The two oils are not interchangeable. After that, most people change the diff oil and transfer/extension case every 50K kms.
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Old 02-25-2012, 02:05 PM   #3 (permalink)
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Thanks annfan. Good choice colour(mine is white too)

Rod
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Old 02-25-2012, 02:37 PM   #4 (permalink)
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annfan, are you sure the transfer case takes GL4? I know the manual transmission does, but I'm sure my owner's manual calls for GL5 in both the diffs and the transfer case/centre diff.
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Old 02-25-2012, 02:54 PM   #5 (permalink)
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My owner's manual for my 2006 2.7L calls for:

Front Differential: 1.0L GL-5 75W-90 or 80W-90

Rear Differential: 0.9L GL-5 75W-90 or 80W-90

Manual Transmission: 1.9L GL-4 75W-85 or 75W-90

Transfer Case: 1.6L GL-4 75W-85 or 75W-90

Extension Case: 0.4L GL-4 75W-85 or 75W-90

Only the diffs take GL-5, everything else uses GL-4.
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Old 02-25-2012, 04:44 PM   #6 (permalink)
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annfan, this is interesting, as my owners manual (also 2006 2.7L) shows a chart specifying API grade GL-4 gear oil for the transmission/extension case, and GL-5 Hypoid gear oil for the transfer case and both differentials (the "extension case" is only on 2WD vehicles).

Why the difference? Am I reading the wrong part of the manual? (the chart I'm describing is on page 9-13, under "Specified Gear Oil").

Various oil viscosities are also listed by temperature, but 75W90 seems to cover everything, so that'd be my choice.

Capacities also seem to be a bit different; on the capacities chart under "specifications," mine reads:

Front Differential: .095L

Rear Differential: 0.9L (2WD) or 0.8L (4WD)

Manual Transmission: 1.9L

Transfer Case: 1.5L (with transfer switch) or 1.6L (without transfer switch)

Extension Case: 0.47L


And, I gotta say, while I understand the requirement for GL-4 in the transmission (won't corrode the brass synchros), I'd expect GL-5 to be specified for the transfer case where the action of the mechanical LSD would seem to warrant the extra friction modifiers and better shear resistance of GL-5 oils. Are there any brass parts in the transfer case?

Last edited by Kootenanny; 02-25-2012 at 04:49 PM.
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Old 02-25-2012, 04:53 PM   #7 (permalink)
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On my 02 XL7 the first change is 7500 miles and its very important to do that. I would say its a good change for bearing damage years down the road if you don't
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Old 02-25-2012, 05:07 PM   #8 (permalink)
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Kootenanny, I'm not sure about your owner's manual, but mine clearly specifies GL-4 for the transfer case. I've attached scans from my manual as well as the pages from the factory manual for the 2.7. They all require GL-4 in the transfer case and GL-5 in the diffs. So that is what I use.

I believe, in theory, it should be possible to use GL-5 in a high pressure gear situation where the is no soft, brass to corrode. It is a better lubricant for sure. I remember this very point was discussed at great length in the forum before.
Attached Thumbnails
Differential oil change-9-13.jpg   Differential oil change-specs.jpg   Differential oil change-diff.jpg   Differential oil change-transfer.jpg  

Last edited by annfan; 02-25-2012 at 06:25 PM.
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Old 02-25-2012, 07:43 PM   #9 (permalink)
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Here are some pics of mine. I do find it interesting that there is conflicting information:

Differential oil change-p2250148.jpg

Differential oil change-p2250152.jpg

Differential oil change-p2250151.jpg
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Old 02-26-2012, 07:49 AM   #10 (permalink)
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I just bought 6L of GL-5 today to do the lot! The guy at repco (ex mechanic) assured me there was not much difference! But he couldn't explain the difference!

What IS the difference / reason between gl4 and gl5?
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