Gl-4 v.s. Gl-5 wtf!?

[s13dan]

OK i have searched and from what i can gather for a nissan manual trannys found in 240s (SR or KA same shit) I should use GL-4 oil. Around 75-90w. GL-5 is bad because of the additives/detergents deteriorates yellow metals, like the syncros. AND some ppl swear by GM or Penzoil synchromesh, which dosnt sound smart to me. Nissan recomends GL-4 but i dont think GL-5 was around when they first designed these trannys. SO WTF should i use, and where can i get it? I ask becuase i cant find just plain ol GL-4 anywhere in town and thats what im thinking is the best choice, but theres no research that i know of proving or disproving anything stated above.

[gijoe69]

just find a local hot rod supply store that sells Redline Products purchase Redline MT-90 gear oil it is a GL-4 synthetic also here is a link for Redline Store Locator so i make it easy for you next time use "SEARCH" Red Line Oil: Dealers (http://www.redlineoil.com/dealers.asp)

[Folken]

even if there isn't research, which there is but I'm not going to find it again I'm lazy, the difference in the way the gearbox feels is amazing w/ redline, just order it if you can't get it local it's worth the 2 day wait

[S14DB]

You can't find GL-4 or a synthetic in GL-4? Most of the Organic 75w-90's are GL-4. Synthetics are harder to find.

Amsoil MTG
Redline MT90
Royal Purple Max-Gear

Are all GL-4 rated Synthetics. Many synthetics like Mobil-1 are only GL-5.

[s13dan]

Im going with MT90, i was unaware that O'reillys carried redline so i ordered some. The oreillys here dont advertise redline at all, zero. And yea the Castrol and Mobil-1 are kinda tricky, they just say they meet or exceed GL-5 ratings,usally on the back which means its a GL-5.

just find a local hot rod supply store that sells Redline Products purchase Redline MT-90 gear oil it is a GL-4 synthetic also here is a link for Redline Store Locator so i make it easy for you next time use "SEARCH" Red Line Oil: Dealers (http://www.redlineoil.com/dealers.asp) As for that i didnt know that redline made a gl-4 oil or i would have been looking for it. Hince the reason for this thread.

[peetiewonder]

i heard royal purple sucked ass though.

[slider2828]

Amsoil number #1 do a search, there is a whole thread dedicated to tranny oil reviews.....
Gl-4 should be used like you said it protects different types of metal. I use GL-5 and no problems here....

[pwhitersxs]

Sycromesh is a no go. It is like water and does not lubricate properly. I used it with bad results.

Napa sells GL-4 based 75w-90. It comes in a little bottle with a green label or a gallon jug with a green label for around 20 bucks.

[racepar1]

First of all do we really need to open up this can of worms again? There are a million threads out there on gear oils, just use the miraculous search button. GL-4/GL-5 doesn't mean shit. It all depends on the particular oil you are using. MT90 is a GL-4 oil and it has been known to screw up tranny's. I use neo 75w90 RHD which exceeds GL-6 specs and have yet to hurt a bearing or synchro in 2 years.

just find a local hot rod supply store that sells Redline Products purchase Redline MT-90 gear oil it is a GL-4 synthetic also here is a link for Redline Store Locator so i make it easy for you next time use "SEARCH" Red Line Oil: Dealers (http://www.redlineoil.com/dealers.asp)


MT90 blows donkey balls and ruins tranny's. Don't use it.

[S14DB]

First of all do we really need to open up this can of worms again? There are a million threads out there on gear oils, just use the miraculous search button. GL-4/GL-5 doesn't mean shit. It all depends on the particular oil you are using. MT90 is a GL-4 oil and it has been known to screw up tranny's. I use neo 75w90 RHD which exceeds GL-6 specs and have yet to hurt a bearing or synchro in 2 years.




MT90 blows donkey balls and ruins tranny's. Don't use it.
API Automotive Gear Lubricant Service Categories (http://www.finalube.com/reference_material/API_Automotive_Gear_Lubricant_Service_Categories.h tm)

GL4 means it's yellow metal friendly. Which our sycros and block rings are made of. A lot of GL-5's are not yellow metal friendly

[cc4usmc]

First of all do we really need to open up this can of worms again? There are a million threads out there on gear oils, just use the miraculous search button.

Word. I was just looking through all the threads a couple nights ago.

[flip3d]

Dan, MT-90 is hard as shit to come across in Missouri. I did however find a store out your way that has some. It's where I get mine from :P

Red Line*Racing MT-90 Transmission Lube*-*SafeRacer (http://www.saferacer.com/red-line-racing-mt-90-transmission-lube.html?productid=449)

SafeRacer
11633 Iris Rd.
Neosho, MO 64850







MT90 blows donkey balls and ruins tranny's. Don't use it.

How do you figure this?

[ho1ywars]

jesus christ... THERE IS A FUCKING THREAD OPEN ON THE FIRST PAGE ABOUT THIS EXACT TOPIC!