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In regards to 2012 Honda Pilot. I replaced my rear differential oil and i might have add a little water into it. Will that affect the differential in any way? Should i drain and fill it again?
 

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Time to drain and fill again...

The only place in a car where water is acceptable is in the coolant, and even then it should be replaced quickly. Water will alter the lubricating performance of your oils and should be removed ASAP.

I know it's inconvenient to do, but why risk it?
 

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These rear diffs can moan & groan if the fluid's contaminated. Change it out using a new fluid pump and keep the work area clean.

How did water get in anyway?
 

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Change it. You should be able to re-use the fluid after you let water sink to the bottom. You never know where that 1 ml would end up and what would rust. Even though everything should be well lubricated by the fluid, you do not want to take a risk of not having AWD when you need it most.
 

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In regards to 2012 Honda Pilot. I replaced my rear differential oil and i might have add a little water into it. Will that affect the differential in any way? Should i drain and fill it again?
I. Have to ask how is it possible that you put water in a differential? And by the way it's not acceptable.
 

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It could make your diff oil foam up........bubbles are not good for lubrication. Let us know what it looks like when you drain it, I am guessing milky looking.
 

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Just a reminder that this is one CC of water, one ml, one gram. It's the residue left in the funnel after it was washed but not dried. It will evaporate when the fluid gets past about 150ºF.
 

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It has nowhere to evaporate to, as the rear diff case is airtight sealed.
 
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