Rear Differential Fluid Change - Subaru WRX Forum
 
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post #1 of 13 Old 08-17-2007, 03:40 PM Thread Starter
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Rear Differential Fluid Change

I have seen many of you changing the fluid to Synthetics, BUT I don't understand what others are telling me about "synthetics rot / eat the silicone that lines the read diff housing" because there is no gasket. Is this just on the 07's ?? Any insight would be greatly appreciated.
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post #2 of 13 Old 08-17-2007, 10:14 PM
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i would just use what your owner's manual recommends

rollin on 17's now and they're dirty
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post #3 of 13 Old 08-18-2007, 01:21 AM
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Where did you hear this? I'd like to know. I just switched. I hope I didn't hurt anything.

All right, where is the distributor cap? I need to find the #1 plug wire to hook up my SUN machine.
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post #4 of 13 Old 08-18-2007, 11:02 AM Thread Starter
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I've heard it from 2 shops out here. You know the "oil change" places. Not that I am running with what they said BUT 2 different places telling me the same thing is weird.
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post #5 of 13 Old 08-18-2007, 11:13 AM
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I've never heard that before..

02 WRX.. "It's fun when it runs.. Problem is that it hardly ever does..."
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post #6 of 13 Old 08-18-2007, 11:18 PM
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I have used 2 different types of synthetic in my rear diff...and definately no leaks.
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post #7 of 13 Old 08-19-2007, 02:54 AM
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I have tryed about every oil out there and have had no prob, i would use redline or royal purple.. I have had the most luck with these two oils.

Brandon
2002 subaru wrx stock....not for long
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post #8 of 13 Old 08-19-2007, 10:08 PM Thread Starter
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But the guys told me that back in the day.... 02-05 WRX's had gaskets. Ours don't, they have this silicone sealant. Make sense ? All of you that are responding have older REX's. Royal Purple is what I want to put into it. 75-140 ?
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post #9 of 13 Old 08-22-2007, 02:15 AM
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i use silcone on everything my mustangs and neon i have red ine in my wrx now

Brandon
2002 subaru wrx stock....not for long
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post #10 of 13 Old 08-22-2007, 05:23 PM
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I didn't put a new gasket on mine when I put the new fluid in, I used Silicone..

02 WRX.. "It's fun when it runs.. Problem is that it hardly ever does..."
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post #11 of 13 Old 08-22-2007, 08:30 PM
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Yes, according to the repair manual, you are to use a liquid silicone sealant on the threads after the change.

Jon
"We live for a good time, not a long time."
RIP Colin McRae
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post #12 of 13 Old 12-26-2007, 02:45 AM
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Quote:
Originally Posted by pzr2874 View Post
I have seen many of you changing the fluid to Synthetics, BUT I don't understand what others are telling me about "synthetics rot / eat the silicone that lines the read diff housing" because there is no gasket. Is this just on the 07's ?? Any insight would be greatly appreciated.
so has this issue been confirmed or is it false?
this is the first time im hearing about it and i know a TON of ppl that run synthetics in their diff and i was just about to but some redline in mine...
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post #13 of 13 Old 12-28-2007, 04:39 PM
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Most newer vehicles are switching to a FIPG (form in place gasket). Whether or not Subarus do this or not, I am not sure. It's the same concept as a normal gasket. Just easier and cheaper to implement. It's highly unlikely that any synthetics contain enough caustic substances to eat thru a seal like that.

Jon
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