Rear differential lubricant
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This is a discussion on Rear differential lubricant within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; Does the rear differential on the WRX-MT need any limited-slip additives? There's no mention of this that I can find, ...

  1. #1
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    Rear differential lubricant

    Does the rear differential on the WRX-MT need any limited-slip additives? There's no mention of this that I can find, but my Corvette required this stuff for proper functioning of its' LSD, and since this is a LSD......?

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    Registered User bdoug's Avatar
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    According to Cobb, you should use a 75W90 oil without friction additives. IIRC, the viscous LSD is sealed, the only thing the oil does is lubricate the ring and pinion gears.
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  4. #3

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    You use EXACTLY the same gear oil as you use in the transmission. It's all in the owner's manual, man.

    -Jim

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    Banned dark_rex's Avatar
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    Originally posted by PPMotorsports
    You use EXACTLY the same gear oil as you use in the transmission. It's all in the owner's manual, man.

    -Jim
    This is correct. I'd shy away from the synthetics. i stick w/ the old school lube, and i've yet to have a problem.

    dR

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    MisterX's Avatar
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    I have tried a number of different synthetic gear lubes with limited success (read; most are really awful).

    The stock gear lube is pretty good stuff. I believe the Redline Synthetic, HD, is superior to anything else I've used.

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    Banned dark_rex's Avatar
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    Originally posted by MisterX

    The stock gear lube is pretty good stuff. I believe the Redline Synthetic, HD, is superior to anything else I've used.
    i've heard good things about redline as well.

    dR

  8. #7
    Registered User GunsNF'nRoses's Avatar
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    I changed it to Mobil 1 synthetic (both trans and diff) at 20K miles about a month ago. I haven't noticed any changes.

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    Thumbs up

    I used Redline MT-90 in my 5 speed transmission in my dearly departed RX-7. I loved that stuff. Shifting was made so much easier. As for the differential, I used the standard Redline 75W90. It seemed to quiet the rear down a little bit. Then again, the engine and exhaust were a little louder than normal. When it's time for a tranny fluid change and differential fluid change, I am going to Redline again. I had Redline's Water Wetter in my cooling system. I doubt I'll need that up here in the NE. You can't go wrong with their synthetic engine oil either. A little on the pricey side, but how much are the parts on your car worth to you?

    P.S. Redline is not what killed my RX - damn o-rings failed.
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