Rear Diff oil
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This is a discussion on Rear Diff oil within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; When I had my STi diff built I was told to use the redline GL5 80W140, for some reason I ...

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    Moderator T0rque's Avatar
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    Rear Diff oil

    When I had my STi diff built I was told to use the redline GL5 80W140, for some reason I bought a case of it.. I flushed my new diff at 500 miles and again at a 1000 so I have a few quarts left.. Is this good or ok to use in my stock diffs on my other subarus?


    Lead Wrench @ WTF Tuning, LLC

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    Good news, everyone! xxxxxxxAnub1s's Avatar
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    That's some really heavy duty oil. It might work, but I wouldn't really recommend it be used in standard differentials. Heavy duty, sure, but standard diffs need more fluidity in their lubrication.
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    The Fruit mangostick's Avatar
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    Quote Originally Posted by T0rque View Post
    When I had my STi diff built I was told to use the redline GL5 80W140, for some reason I bought a case of it.. I flushed my new diff at 500 miles and again at a 1000 so I have a few quarts left.. Is this good or ok to use in my stock diffs on my other subarus?
    Dunno about the subaru but I've run that in every open and locked up rear diff application I've ever had that saw any sort of abuse. We're talkin everything from chevy trucks/Jeeps/68 bronko, T-bird turbocoup, merkur xr4ti... if anything it will hold its viscosity better under thermal load. Isn't going to hurt anything if thats what you're concerned about.
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    Moderator T0rque's Avatar
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    It's a 70/140 so really the only time it would be "heavy" is if it was hot.. In that case the extra protection would be good


    Lead Wrench @ WTF Tuning, LLC

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