GL4 and GL5, what gives??? Transmission fluid question...

[lbrowne]

Ok so I read on here everywhere to not get GL-5 gear oil for the 240sx transmission, that it eats the synchros. I know many on here put Redline gear oil in their transmission and the general accepted weight is 75/90 for most gear oils used.

Well...

I've been to 2 shops and none of them carry GL-4. The coveted Redline gear oil lists as exceeding GL-5 requirements. So what gives??

I found 2 brands of gear oil, that listed as meeting or exceeding both GL-4 and GL-5 on the label. Nothing that says just GL-4.

So man up fellas and tell me what you use because I'm not going on a wild goose chase for oil that isn't out there. (this elusive GL-4 only oil)

edit: you guys must be using MT90 from what I can now tell, I was looking at the wrong redline product!
Modified by lbrowne at 12:48 PM 7/27/2007

[lbrowne]

I found a local supplier of Redline thank god. Those other shops had nothing that I could use. I had the meets GL4/GL5 in my hand and decided to put it back until I verified everything on here.

Excuse my panic, the heat is getting to me! lol

[ddgsxr504]

Redline is hard for me to come by as well so I just run Royal Purple.

[Moto Man]

You want oil that meets the GL-4 requirements. If it meets the GL-5 requirements as well, that's ok.

[battleroyale]

the big worry about the gL-4 and gL-5 debate is that some gL-5's aren't yellow metal friendly, and they can wear out your brass syncros

I emailed valvoline and some other oil manufactures before to clear this up and they said that it would be fine to use their gL-5 formula with yellow metals