Differential fluid

[Rob Loww]

Thinking about changing my front and rear differential fluid and the fluid in the transfer case in my 2007 gmc Yukon. It never been changed before. Should I change it or leave it alone. The truck has 165000 miles on it. Also what kind of due I use.

 

[AZSCTACO]

Change it....Amsoil or Mobil 1

 

[08grey]

Dealer fluid


Sent from my iPad using Tapatalk

 

[08mericxldenali]

im planning on doing this to mine. Transfer case uses dexron VI right? what about rear and front differential? Thanks

 

[OR VietVet]

Sorry to be so dense but what does the owner's manual say?

 

[lt1gmc]

Sorry to be so dense but what does the owner's manual say?

Manual says standard 75-90 lube in front, 75-90 synthetic in back, Dex 6 in transfer case. I used synthetic in front as well and no issues, changed at 120,000 and now at 165,000. Synthetic will give a marginally better mileage in cold weather operation.
I always change all the fluids at 100k or so, you will see when you pull the magnetic plug off the front diff, or transfer case. Transmission should be changed as well in my opinion. Amazing amount of stuff on the magnets.