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.
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.
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.
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.
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