Can I use AmSoil Synthetic Gear Lube (SAE 80W90 API GL5) in my 2005 6MT transmission and differential?

 

bump anyone???

 

Absolutely NOT!!! I spoke with the dealer and they cited the repair manual and it says "API GL-4, Viscosity SAE 75W-85 or 75W-90". The GL5 crap "will damage the synchros in the Nissan transmission". Check out http://www.350z-tech.com/zwiki/Tutor...n_Fluid_Change.

I would recommend going to the dealer to buy the tranny fluid, however its $16 bucks a quart. Went over to the nissan dealership and they had the same price.I wouldn't risk saving $45 to buy regular tranny fluid and eat up your gears....would you? Hey, you already saved ~$500 doing the 30k maintenance yourself....get the nissan manual tranny fluid and have a peice of mind, really.

There you will find how to replace your fluid. Also, i don't know about using synthetic, i hear its not good to switch on your tranny. Also for your differential. I hope you didn't put GL5 in your tran.

Hey does anyone know where to find transmission drain plug gaskets????? Please help

 

First off, if your going to upgrade to full synthetic oils, you might as well go with the absolute best. In this case, you might as well use Motul. They make some of the worlds most advanced oils, not to mention the JGTC GT500 Nissan Skyline uses all those oils exclusively. Mind you, these oils arent cheap by any means, they are pretty much the absolute best.

Your manual transmission will use a API GL-4 based oil, your rear differential will use a API GL-5 gear oil including a limited slip additive. It does *NOT* matter if you use 75w-85 or 75w-90... it makes absolutely NO difference. Believe me, I've worked on enough cars to realize that.

Now if you want to stick with Motul, then you can use the following, you won't be sorry either.

DIFFERENTIAL: MOTUL GEAR FF-LSD COMPETITION 75W90 GL-5 (The nice thing about this oil is that it already is friction modified, just dump it in and go).

TRANSMISSION: MOTUL GEAR 300 75W-90 GL-4

BRAKE FLUID: MOTUL RBF-600 DOT (I know this is off topic, but you should consider replacing your brake fluid with this stuff. This with steel braided line upgrade will help you brake very nicely, it has a boiling point almost double some of the other brake fluids and will help u avoid a spongy feel in your brake.)

Don't listen to anyone else, SYNTHETIC is perfectly fine to use. My shop uses synthetic oils in differentials, transmissions, etc. and we are warranty approved. Its PERFECTLY fine to use GL-4 in your transmission, and GL-5 in your differential.

 

+1 Synthetic is a NIGHT and DAY difference on our trans/diff.. Shifting is SOOO much smoother.. just a little bit longer warm up..

Remember to use the friction modifier when buying the OEM stuff..
OEM 75w-85 Trans/Diff Fluid - Part No. DAT999MPMTF00P
OEM Friction Modifier - Part No. DAT1491

Still breaking in the trans/diff so im sitting on the stock stuff =)

 

I've been using Shell Spirax S 75W-90 in my tranny and differential for around 8K miles now. Sure does make shifting a lot smoother and improves the fuel economy around 1mpg overall when compared to the stock fluid. This fluid is designed to withstand the cross-country driving that big rigs do, so if you look on the Shell site, I believe it's guaranteed for 750K service intervals, which is more than enough.

For more information, read these two threads:

https://g35driver.com/forums/showthr...ht=shell+fluid

https://g35driver.com/forums/showthr...7&page=1&pp=40

 

"I believe it's guaranteed for 750K service intervals, which is more than enough."

Check the capacity of the trucks tranny and differentials.......they use 5-9 times as much fluids ...........how they gain longevity.

 

Based on your experience, what kind of tranny/diff fluid would you recommend?

 

What are the capacities of the manual transmission and LSD? I looked in the manual but the capacity is blank. It only tells you what type to use.

 

How many quarts of differential fluid does a '04 G35 coupe take? Thanx!!!!

 

I too have been using the Spirax gear oil in the transmission and rear differential for a second season in the G35. Not to mention also in my trucks front and rear diffs. I regularly track the G35 and haul a heavy fifth wheel with the truck. By far the best gear oil I've used to date. Super smooth shifting and no rear diff whine. Checked the oil condition this spring and still great shape.

Should also mention that the Shell's Spirax GL-5 gear oil is also backwards compatible to a GL-4 spec. The key is the copper corrosion test specs. If it's not corrosive to yellow metals, it has met most of the GL-4 specs.

So far I'm very happy with the performance, cost and flexibility of the gear oil. I buy it by the pail and change the transmission, and diffs of all my vehicles at once.

The rear diff uses around 2 quarts and the transmission uses about a gallon. If you purchase two gallon jugs, you will be covered, with some spare fluid left over.

 

Oh ****... I've never heard that! I hope I don’t have a problem... several months ago I spewed tranny fluid due to after market AT fluid cooler return line pressure forcing hose off when I stupidly down-shifted in MM mode at high speed/rmp... Anyway, I simply re-filled with OEM trans fluid and everything has been fine. Should I have used this "fiction modifier"?... Since I didn’t what are the implications?

 

How many quarts do I need for the tranny and how much for the diff?

 

I use redline MT-90 GL-4 in the tranny and 75W90 GL-5 in the diff.

I know the diff uses 1.5qt
I believe the tranny uses 3qt?

 

These guys are talking MT, not AT. Don't get confused. The friction modifier I believe is for the LSD (in the rear diff, not the tranny).