I need to change my rear diff oil. Anyone have any recommendations on brands/viscosities? Thx!

-=drew=-

 

Try Amsoil,Redline or Royal Purple. check out their sites.
I prefer Royal Purple, Max 75W-90. I run in both the MT and the LSD. but other synths are very good as well.

 

nogo on the mobile 1 synth?

-drew

 

This is a totally stupid question, but what exactly does the rear differential fluid do? What's the recommended change interval? I know for my Frontier, it's 60k miles.

 

Lubricates the up to $2500 differential gears [VSLD] less without.
The differential is the highest frictional loss unit [except for tires] in the drive train [8% losses at cold low rpms/speed dropping to 2% when warm at cruise rpms].

Owners who have never paid to replace one after warranty are missing out on a learning experience.

Like all lubricants the optimum low friction point is above 150F and below 220F...........good quality pure synthetics can reduce friction up to 1% ........more in cold weather and still run cooler in summer. A Rear HP bargain.

 

Definitely not a stupid question.

The interval for the G is 30k miles, but people that have elected to change it early have been finding significant amounts of metal in the fluid.

"America will never be destroyed from the outside. If we falter and lose our freedoms, it will be because we destroyed ourselves."

-- Abraham Lincoln

 

On the strong recommendation of my friend, I just had the differential oil changed on my 6MT sedan [at only 3800 miles]. It certainly did have a noticeable amount of metal chips in it [to my surprise] from the break in of the car. So I too would recommend others to change their differential oil early.

 

I used Moble 1 75-90W Synthetic Gear Oil. It took just over 1-1/2 quarts.

DaveO
03 G35 AT Sedan / DP / Willow / Premium / Sport / Aero / Mods / 262 & 260.8

 

Mobile one is fine, (much better than OEM).
Amsoil is little better than Mobil1
and RP and Redline are pretty close and the best IMO.

 

I changed mine very early at 1000 miles and found plenty of metal. I used AMSOIL 75W90 Series 2000 gear oil in the trans and diff.

 

fyi

I've posted this before in another thread but here's a site with a lot of useful info on oil.

http://www.bobistheoilguy.com/

The forums on there are really helpful. I've heard that Mobil1 isn't full synthetic. Redline, Amsoil, and another - I forget which one are full synthetic.

04.5 G35C TB/Graphite 6 speed, XM Radio, Premo Package, Navi, OEM Chin Spoiler

 

ZeroGen,
_____________________________________

"I've heard that Mobil1 isn't full synthetic."
_____________________________________

According to the printing on the bottle, Mobile 1 meets the API GL-5 standards for 75W-90 gear lubricant, it also says...

"Mobil 1 Synthetic Gear Lubricant is a race proven FULLY SYNTHETIC product that outperforms conventional extreme pressure type lubricants in both conventional and limited slip applications... "

I'm sure we can agree that there's many good gear lubes out there to chose from. I used Mobil 1 because it's readily available where I live and the others aren't.


DaveO
03 G35 AT Sedan / DP / Willow / Premium / Sport / Aero / Mods / 262 & 260.8

 

http://www.g35world.com/amsoil

Amsoil Dealer, wholesale prices.

2004 Infiniti G35S, 6MT, Premium, Sport, DP
Mods: JDM Clears, 20% tint, Z-tube, Stilen CAI
Track: 14.32 at 98.79 mph 2.2032 60ft
Dyno 07-07-04 - 234.2 hp & 233.8 tq
http://www.g35world.com

 

DaveO

Thanks for the info. Don't quote me on the "Mobil1 isn't full synthetic." I may have read or heard that it wasn't but then again, it could have easily been another oil. Also, I do believe that Mobil1 is a good synthetic oil. It's basically personal preference on which to use.

Anyhow, here are a couple more informative links on synthetics:

http://www.1st-in-synthetics.com/newsletter_1000.htm

http://www.caranddriver.com/article....&page_number=1




04.5 G35C TB/Graphite 6 speed, XM Radio, Premo Package, Navi, OEM Chin Spoiler, Hard wired V1

 

I thought I read that it was Castrol that wasn't a true synthetic. Mobil 1 is I believe.

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