GL-4 or GL-5?

[knowleqe]

hey everyone, i have a dilemna about which gear oil to use. currently i have valvoline durablend 85w140, which is gl-5. my friend reccommended it because he says it protects the yellow metal in our trannies. but lately i have been reading that we should be using gl-4. if this is a repost im sorry, but i have used the search button.

thanx

[SWIFT_DRIFT]

gl-4 big boy. time to get a fsm.

[skitzo]

It doesn't even really matter that much, the weights really whats important.

[MrFox]

GL4 for trannyGL5 for diffGL5 corrodes syncros

http://www.nissaninfiniticlub....26044

(Note: I couldn't find this thread using search either... even if I typed in the exact title)

[knowleqe]

...Nissan transmissions use GL-5. It's recommended from Nissan and is what comes in the car stock.

that was from that link you jus sent me fox. im confused, i'm hearing from both camps, gl-4 and gl-5

[IvoryJ30t]

It doesn't even really matter that much, the weights really whats important.

its gonna matter when your syncros evaporate:D

[MrFox]

Read a little futher down... a scan of relevant data from the FSM was posted by Hachi.

There is a high-contact-pressure additive in GL-5 oils that eats up syncros. Can't remember what its called at the moment...

[knowleqe]

how is mobil 1 gear oil? does it hold up as well as redline?

[MrFox]

Unfortuantely, Mobil 1 is a GL-5 grade oil.From the same discussion on FA, the top contenders for transmission oil (in no particular order):

Redline MTL/MT90GM SyncromeshAmsoilNeo

[knowleqe]

thanx fox, can you send me a link to the freshalloy thread?

[MrFox]

http://forums.freshalloy.com/u...45804

I must've gotten the info for the additive off a third board... can't remember.

Anyways, here's the cheapest place to get redline: http://myoilshop.com/AutoPrds.html (10%-off dealer code 675421)

[quiksilvia]

i use mt90 and so do a lot of peeps