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manual transmission lubricant #263052 02/06/01 08:00 PM
Anonymous
Unregistered
The 90 4door Montero that I recently bought to replace my V6 Raider is driving better in every way except for the transmission. 2nd gear is really irritating me. Recent posts indicate that I am far from alone. Anyway, I have seen Red Line MTL recommended to smooth it out. It certainly makes my Miata happier (2nd synchro worn out there too; both vehicles over 100,000 miles), but I have also seen posts that indicate GL4 to be very bad for Montero synchros. Those posts said GL5 is needed. Checking the Red Line web page, I see that MTL is a GL4 lubricant.<P>Comments? Recommendations?<P>Thanks,<BR>-Rod

Re: manual transmission lubricant #263053 02/06/01 08:06 PM
Joined: Dec 1999
Posts: 2,329
Augie Offline
Body Damage is Cool
Nope you got it wrong. GL4 are preferred anytime a syncros are present. At least on Japanese manual tranny. <P>GL5 are preferred for Hypoid gear use such as differential gear. <P>You would be fine with MTL or MT-90. Use MTL if you live in colder climate, Use MT-90 if you live in warm climate.

Re: manual transmission lubricant [Re: Anonymous] #1102835 01/23/17 04:21 AM
Joined: Jul 2011
Posts: 26
Maciek Offline
Getting the Wheeling Fever
So, what's everyone currently using, anything available off the shelf at the local auto parts? Everything seems to be GL-5/for limited slip...

Last edited by Maciek; 01/23/17 04:22 AM.

'88 Raider - 250+K | 2.6L G54B; no balance shafts, non jet-valve head, ARP head studs| Weber 32/36 DFEV | Pacesetter 4>1 | 2 1/4" magnaflow | 32" BFG A/T | 2" bar crank & add-a-leaf | +2 SkyJackers | bumpstop del | Optima Yellow-Top | Curt GenII receiver
Re: manual transmission lubricant [Re: Maciek] #1102838 01/23/17 06:42 PM
Joined: Jan 2017
Posts: 17
L
Lha1988 Offline
Need a Spot
GL5 will eat up your synchronizers,as they are bronze. I couldn't find any in my area,and use 20w50 motor oil with great results. I'm sure that I will get some feedback on this,but the shifting improved a lot,and after 350,000 miles,that's good.

Re: manual transmission lubricant [Re: Anonymous] #1102842 01/23/17 11:06 PM
Joined: Feb 2000
Posts: 6,239
4x4Wire Offline
Trail Leader
***
85w gear oil. According the back of the bottle it is good for GL3, GL4 and GL5 applications.


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Re: manual transmission lubricant [Re: 4x4Wire] #1102843 01/23/17 11:19 PM
Joined: Jan 2017
Posts: 17
L
Lha1988 Offline
Need a Spot
Most I've seen said good to top off when GL-3,4 are used,not to replace. Synthetic may work,though.

Re: manual transmission lubricant [Re: Anonymous] #1102846 01/24/17 05:47 AM
Joined: Dec 2014
Posts: 26
marksroberts61 Offline
Getting the Wheeling Fever
Sta Lube (?) At NAPA is the only GL-4 lube I have found on the shelf. Stay away from any that say GL-4 & GL-5 compatable, they are Gl-5 oil, admittedly a better high pressure gear lube, but hard on synchros. There has been lively debate here about this, but Mitsu directly specifies GL-4 for the x-fer case with GL-5 for the diffs, must be for a reason.


1995 SR, dark blue, cloth seats, flare and cladding delete, upcoming sunroof delete,10 Guage custom skid plates, ham radio
Re: manual transmission lubricant [Re: Anonymous] #1102853 01/25/17 09:28 PM
Joined: Jul 2011
Posts: 26
Maciek Offline
Getting the Wheeling Fever
I keep reading the same thing about GL-5 and brass synchros. I'm glad I did some research because both My user manual and factory service manual specify "GL-4 or higher" for all fluids. Guess I'll order a few quarts of MTL or MT-85, or go cheap with a jug of the StaLube 85-90, seems a little thick but reviews are good. The old stuff in there now takes a few mins to warm up when it's freezing anyway (prolly used the same stuff last time, but that was a loong time ago when i first got the truck).

[Linked Image]

Thanks,
~Mac

Last edited by Maciek; 01/25/17 10:24 PM.

'88 Raider - 250+K | 2.6L G54B; no balance shafts, non jet-valve head, ARP head studs| Weber 32/36 DFEV | Pacesetter 4>1 | 2 1/4" magnaflow | 32" BFG A/T | 2" bar crank & add-a-leaf | +2 SkyJackers | bumpstop del | Optima Yellow-Top | Curt GenII receiver
Re: manual transmission lubricant [Re: Anonymous] #1103214 03/21/17 12:20 AM
Joined: Jan 2000
Posts: 7,309
PHIL_ Offline
Trail Leader
*****
GL5 in front and rear diffs, GL4 in tcase and trans. Redline MT90 is GL4 and puts those syncros in their happy place.


1991 HZJ77, 1999 KZJ90, 1999 UZJ100, 1992 M101CDN2
https://www.thegearheadproject.com/category/jdm-journeys/








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