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Rear differential fluid question

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Hello, i'm new to this forum. Just had a question regarding the rear diff.
I'm going to be doing some maintenance on my friends '06 pilot. It has almost 200,000 miles and she's NEVER changed the rear diff fluid. I know, yikes...
If i drain/fill it twice, will it cause it to fail faster since the fluid is still the factory fluid?
Or has any of you drove it around that long with the original fluid? Wasn't sure if i should just leave it alone or drain/fill twice. I'm planning on doing the trans 3x drain and fill as well. She's had it drained/filled a few times.
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Discussion Starter · #5 ·
There is also a transfer case next to the transmission that needs periodic fluid changes with 80W-90 gear oil.
yep, gonna do that as well. I have an 09' Acura Tl SH-AWD. i always do the transfer case with the rear diff fluid change on my car. I'm just shocked she allegedly never changed either rear diff or transfer case.
 

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Discussion Starter · #7 ·
Thanks guys for the replies! I'll definitely post a few pics of how dirty the oil is. I'm also doing her timing belt, water pump, spark plugs, valve adjustment and A/C compressor since its making a noise. TB/WP HAS NEVER BEEN CHANGED EITHER! I told her she's lucky the timing belt hasn't snapped. These are interference engines so it would've definitely bent a few valves if the belt broke.
 
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