I plan on replacing my rear-diff fluid. I have a non LSD g35c. Anyone have a part # or know where I can order the fluid? I am assuming you have to use nissan spec fluid.

 

Nah...I use 75-90 Mobil 1 full synthetic. Get better gas mileage now. I you dont know what you are doing, just take it to the dealer.

my $0.02

 

How do would i know if i had the Limited slip rear?

 

Do you have LSD? I am having a mechanic do the work for me I just have to purchase the oil.

 

If you have the 18's then you have an LSD (G35c)

 

The G35's with the 18in wheel package (like mine) have a VLSD which has its own separate fluid. Thus you can use the same stuff in both cases (LSD and non-LSD). I changed to Redline 75w90 at 1500mi and felt an immediate improvement on cold mornings. With the OEM fluid it felt like I was towing something until it warmed up, now it runs like butter I did alot of research and the general consensus was that Redline and Amsoil have the best diff. oils.

 

They do have the best oils...but try finding the stuff.....

 

Thanks I appreciate a quality answer. I feel the love on the boards.

So the 2003-2004 with 18s have the limited slip rear, but on the 05s you have to have the "sport tuned suspension" with 19s?

 

Correct.

.

 

Thanks, Bummer about the error on the 05's, you have to spend all that money and if you dont like the rims oh well you had to have them to get the limited slip rear.

 

What was wrong with the answer

I saw you have an '03 G35. The simplest answer was if you have 18's you have LSD. What else do you want?

 

Maybe I am misunderstanding. What fluid can I use to replace the (non LSD) rear diff fluid on my 03 G35 coupe?

 

The Nissan spec for diff fluid is 80W-90 API GL-5. If you don't have the LSD, then you have no special requirements for diff fluid other than the Nissan spec. There are several good ones on the market including:

Dino:
- Shell Spirax 80W-90 API GL-5

Synthetic:
- Royal Purple Max Gear 75W-90 API GL-5 certified (can also be put in the tranny since it meets GL-4 ratings as well so as not to wear out the softer synchros) - this is great stuff and can be bought online
- Redline 75W-90 Gear oil (also great stuff) but don't use it in the tranny! API GL-5 certified
- Amsoil 75W-90 Gear oil (good stuff; meets API specs but is not actually API certified, AFAIK)

 

www.amsoil.com

 

After talking to several dealers, I am only going to put OEM fluid in the tranny...just too important to mess with it.

Seperate question.....do I have anything to worry about having a 75W-90 in the differential, since specs require 80W-90?
What is the difference in the 5 points?