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Old 03-30-2010, 03:55 AM   #1
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Default Rear Differential gear oil?

what do some of yall recommend for Rear Diff gear oil?

im going to be draining the stuff thats in my diff more so to check it and make sure all is well and that there are no metal shavings in there! im just curious to know whats the best stuff to replace it with!

so whats yalls recommendations?
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Old 03-30-2010, 04:01 AM   #2
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Full synthetic is usually best in my opinion.Mobil 1 and Royal Purple are both good.
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Old 03-30-2010, 04:11 AM   #3
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i already did a lil search on it before people start bashing me!

people say Redline 75w90! what are some other choices? i would just like to hear it from the guys who really push their cars to the limit than some ***** footers that dont!
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Old 03-30-2010, 04:13 AM   #4
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Full synthetic is usually best in my opinion.Mobil 1 and Royal Purple are both good.
+1 on full synthetic. Redline, Penzoil and Amsoil also have good products.
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Old 03-30-2010, 08:01 AM   #5
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Mobil 1.

Or, just any 75-90 gear oil.
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Old 03-30-2010, 09:10 AM   #6
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Redline LightWeight ShockProof Gear Oil

I used to run the heavyweight, but my engine guy who also used to crew chief for an MX5 cup team suggested the lightweight was enough and that I would have less parasitic loss.

If you run a clutch type diff, all bets are off.
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Old 03-30-2010, 10:11 AM   #7
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The shock-proof is too much.

my preferential hierarchy for 75w90:
motul
redline
amsoil
M1
dogshit
royal purple
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Old 03-30-2010, 10:27 AM   #8
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oh, and change the oil in the front diff too.
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Old 03-30-2010, 11:07 AM   #9
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Redline
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Old 03-30-2010, 11:30 AM   #10
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oh, and change the oil in the front diff too.
Should I use the same stuff in the transfer case, or is that just distilled water?
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Old 03-30-2010, 11:36 AM   #11
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75-90 mobil......I got 4k on my synthetic fluids and I like it.
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Old 03-30-2010, 11:38 AM   #12
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Should I use the same stuff in the transfer case, or is that just distilled water?
Why use water when you have a 55-gallon barrel in your bedroom provided by your handball top boyfriend?
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Old 03-30-2010, 11:42 AM   #13
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75-90 mobil......I got 4k on my synthetic fluids and I like it.
What do you like about it? I'm interested to hear what kind of feedback you've obtained from the rear end lubrication from the driver's seat. I'm more interested to see your oil analysis data.
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Old 03-30-2010, 11:52 AM   #14
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Should I use the same stuff in the transfer case, or is that just distilled water?
Water is fine just make sure the VSC is turned off
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Old 03-30-2010, 01:28 PM   #15
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Originally Posted by Chris Swearingen View Post
Redline LightWeight ShockProof Gear Oil

I used to run the heavyweight, but my engine guy who also used to crew chief for an MX5 cup team suggested the lightweight was enough and that I would have less parasitic loss.

If you run a clutch type diff, all bets are off.


+1 on LWS. I've been running it for 2-3 years now in the tranny and rear diff. Even if you drain it, it leaves a protective layer of smurf blood.
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Old 03-30-2010, 01:39 PM   #16
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+1 on LWS. I've been running it for 2-3 years now in the tranny and rear diff. Even if you drain it, it leaves a protective layer of smurf blood.
how many diffs does your car have?
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Old 03-30-2010, 01:45 PM   #17
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thanks for all the responses! i think im gonna try out that LWS smurf blood!
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Old 03-31-2010, 02:58 AM   #18
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So royal purple 75-90 is also good to use on my 6 speed tranny?
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Old 03-31-2010, 03:00 AM   #19
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So royal purple 75-90 is also good to use on my 6 speed tranny?
im running redline in my trans, but i dont remember the wieght! 75w90 seems a lil to heavy for the trans!
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Old 03-31-2010, 03:02 AM   #20
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Quote:
Originally Posted by hustler View Post
oh, and change the oil in the front diff too.
Goddamn it! I hate you! You always beat me to smart *** comments. I'm used to being the only smart *** on other forums. Still not used to you being superior on this forum. Of course I'm only late by about a day.

I've been running Royal Purple for over a year and haven't noticed anything (good or bad). So I guess that is good?
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