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#263052 - 02/06/01 08:00 PM manual transmission lubricant  
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



#263053 - 02/06/01 08:06 PM Re: manual transmission lubricant  
Augie  Offline
Body Damage is Cool
Joined: Dec 1999
Posts: 2,329
Ohio
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.


#1102835 - 01/23/17 04:21 AM Re: manual transmission lubricant [Re: Anonymous]  
Maciek  Offline

Getting the Wheeling Fever
Joined: Jul 2011
Posts: 26
Seattle, WA
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

#1102838 - 01/23/17 06:42 PM Re: manual transmission lubricant [Re: Maciek]  
Lha1988  Offline
Need a Spot
Joined: Jan 2017
Posts: 17
Tennessee
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.


#1102842 - 01/23/17 11:06 PM Re: manual transmission lubricant [Re: Anonymous]  
4x4Wire  Offline

Trail Leader
Joined: Feb 2000
Posts: 5,747
Lakeside, CA ***
85w gear oil. According the back of the bottle it is good for GL3, GL4 and GL5 applications.


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


#1102846 - 01/24/17 05:47 AM Re: manual transmission lubricant [Re: Anonymous]  
marksroberts61  Offline

Need a Spot
Joined: Dec 2014
Posts: 24
California
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, 10 Guage custom skid plates, ham radio

#1102853 - 01/25/17 09:28 PM Re: manual transmission lubricant [Re: Anonymous]  
Maciek  Offline

Getting the Wheeling Fever
Joined: Jul 2011
Posts: 26
Seattle, WA
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).



Thanks,
~Mac


Attached Files
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

#1103214 - 03/21/17 12:20 AM Re: manual transmission lubricant [Re: Anonymous]  
PajEvo  Offline

Trail Leader
Joined: Jan 2000
Posts: 7,304
Airdrie, Alberta, Canada *****
GL5 in front and rear diffs, GL4 in tcase and trans. Redline MT90 is GL4 and puts those syncros in their happy place.


(The artist formerly known as PHIL)

OldBetsy #7 - 1997 Pajero Evolution (no.581)
OldBetsy #6 - 2003 Montero XLS (her rig)

SOLD: 93 Pajero 2800 turbo diesel: "Ol'Betsy #5"


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