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Rear Differential

16509 Views 37 Replies 18 Participants Last post by  DaleB, 
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Does any body know if the rear differential (for 4WD) is really needed very time you have an engine oil change?
I sent my MDX last weekend to the dealer for the first oil change (@4200 miles) and they suggested changing the rear differential oil. I didn't have them change it because the cost was $87.99 +tax.
I checked in the manual and it mentions that the engine oil and rear differential oil needs to be changed every 7500 miles.
First of all, does the oil need to be changed or just check its level?
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andrewPDX
There is a difference between the factor VTM-4 fluid and the fresh stuff. It looks like there is metallic dust in the VTM-4 fluid.

When we first emptied out the VTM-4 fluid, the mechanic and I thought that I had done something worse than poke a hole:
http://www.acuramdx.org/forums/showthread.php?s=&postid=175680#post175680

Put after further analysis, there's way too much of that dust in there to be from anything I did. I think it is in there for the break-in.

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andrewPDX
I wish I took a picture of the drain pan full. There is so much of that metallic particle in it, it forms a brain like pattern in the VTM-4 fluid. The particles do settle to the bottom of the pan if you wait overnight. Then it just looks like VTM-4 fluid. All the sand/dust looking stuff in the picture are the metallic particles.
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