DIY: Rear Differential Oil Change

cossie1600

It's too late now, just do it and see what comes out of it. The diff fluid is only a lubrication for the gears anyway, I don't think it changes the LSD since the LSD is in a sealed unit inside. I guess you can argue it can cool the LSD unit better as the fluid soaked in it can have a lower temp. Personally I will change it again at 6500 miles and see what it looks like. SInce I already have all the tools, the parts really only cost me $25 (2 quarts of 75W90 GL-5 fluid)

Ron

so change it every 6.5k miles?

cossie1600

for me yes. i would say not more than 2 years for most people. personally i am going to make a more definitie judgement at the next change as nissan might have crappy fluids too. amsoil are rated for 100k miles, but i will see how it handles 200 autox runs a year

silver streak

Well I have just changed out my diff. fluid with the Redline 75w90 fluid @ 8200 miles I got the car with 2700 miles on her and Wanted to do a complete oil change on her once I had her good and broke in I did the engine with the Redline oil as well and will be doing the trans. tomorrow when the oil arrives from Redline my local Redline dealer did not have the MT-85 in stock wityh the rest of the oil's.
I want to thank Spearfish for his write up great job much reps.

Rich

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[B][B]Rich Garrett

EVOnomore

Just did mine at 2900 miles.What came out just scared me.Black stinky oil,and about half an inch of metal shaving on the magnet.Hope that is part of brake in.
Will do another change in spring,or at least once a year.Filled with Redline Gear Oil 75-90.Tranny is next.Hope the warm weather holds up,so next weekend project.Great write up.

Footloose301

I changed my diff oil today and ScGRacer stopped by in his white Nismo to do the same. I have 27k on my car and figured it was about time to do the change. Redline was not available locally so we each grabbed two quarts of Royale Purple 75W90 which claims to be great with LSD's and is both GL-4 and GL-5 compatible. I'm sure you don't have to change it so early but it's piece of mind.

I'm under my car, ScGRacer helping out.


You can see all the metal shavings and sludge stuck to the magnetic bolt.

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2010 40th Anniversary 370Z

ZForce

Just did both of the Z's today and surprised at the color of the oil drained and the xxxxxxx on the magnetic drain plug.

First some history on both car(s).

Both are 2009 MT w/34k miles on the OEM factory installed gear oil (as in never been drained)
Reside in Northern California
Cars are garaged all of the time
Daily Driven and spirited canyon driving


After viewing the magnetic drain plug and the color of the oil being drained and after reading and seeing and hearing a lot of members drain results has me wondering IF the difference in my drains and the rest has anything to do with geographical location/weather and whether or not the car is garaged.

Any-who here are the pics. Both Z's had the same results. No sludge and hardly any metal shavings. The oil being drained still has the honey colored. All I can say is I am glad it looks like this at 34k miles on it's first drain.












.

Chico370Z

^ interesting.....

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04 Nissan Sentra SpecV: Brembos, Nismo Intake/Exhaust/Short Shifter, Eibach Sportlines, ES MMI - SOLD / / / 09 Nissan 370Z Touring: Invidia Gemini Exhaust, ERZ HFC, GTM 25 Row Cooler, Z1 Tubes, and K&N Drop Ins

eastwest2300

im looking forward to changing mine. This looks like fun! I'll be changing mine around 3500 miles.

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Infiniti QX70 & Toyota Supra 3.0 Premium

tranceformer

beware of foul odors when you drain the fluid.

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Ray
2009 370Z Base Sport 6MT / 12.860 @ 109.09mph / 1.921 60ft / street tires
official 1/4 mile track times

eastwest2300

I changed my differential fluid today.. the process was fairly easy, I only had issues getting the actual fluid in the differential itself, having an aftermarket exhaust and the loaction of the filler hole made it a pain in the azz. But all in all, Im happy. I used Mobil 1 75w-90 Synthetic.

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Infiniti QX70 & Toyota Supra 3.0 Premium

Alchemy

Gotta do mine in the spring. Subscribed for future reference.

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Ryan
314WHP | 260LB-FT | STILLEN | KONI | SWIFT | STOPTECH | Z1 | PROJECT MU | CNT | UPREV | FORGESTAR | BRIDGESTONE | PWJDM | ENEOS | MOTUL

ggiwin

I just went to a shop to get it done. They said I needed 3 quarts not 2. I was confused by this and referred to this thread. They said it requires 3 and that they won't do it using 2 quarts as it is not safe?

spearfish25

Not as safe? LOL.

They are screwing up their units. For the record, it takes 1.5 quarts which is 3 pints. If you buy 2 quarts, you have more than enough oil to completely top it off and have some left over.

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2013 Cadillac V-Wagon, RIP Z

Phaddi_inc

another good write up, thanks!
(rep'd)

phaddi_inc