Mt-90 for my '92 Nissan MTF?

Status
Not open for further replies.
Z

Zesty

Joined
Apr 10, 2006
Messages
121
Location
Central Coast California
OK, I have a quick question. After some research, it seems like the Redline MT-90 is pretty highly praised among Nissan owners. I was looking to buy a few quarts, and then I read a few posts suggesting mixing the Mt-90 and the MTL in a 50/50 ratio, for better performance, citing the imported cars' tight transmission tolerances.

Basically, I live in Cenral Coast California and it rarely freezes on the coldest nights. So I don't need the MTL for cold-weather performance.

My car also has close to 213,000 miles on it, so I'm leaning towards running 100% MT-90, unless someone can give me some reasons why to mix things up with the MTL.

So living in my moderate climate, with my high-mileage Nissan, should I go with the MT-90(I'm leaning towards it), or is there an advantage to doing the mix? Thanks.
 
Honestly, I'm embarassed to say I don't even know the specifics, but it is the stock one I assume. Sorry.

*Edit* Also, thanks for the help. 100% MT-90 is what I'll go with.
 
Hi there,

Maybe you can use GM Synchromesh made for Corvette Tranaxles. It is reputedly superior.

THe only issue you can have with MT-90 is possible leaking of transmission fluid and contaminating your clutch. If you are not sure that the seals will stand, make sure you get conventional 85W90. If you want an excuse for replacing the clutch, go with MT-90.


W115nut
 
My 01 max 5 speed started to leak after about 40K miles on MT-90 (started using it at 30K). Try Amsoil MTG.

W115, is the GM synchromesh GL-4 or dual rated?
 
Hi CCS2k1,

VW drives need all the help they can get since many of them have difficult 1st to 2nd shifts, their synchronizers are shot.

Reputedly, Synchomesh is even better than RL MT90.

In my case, the transmission started leaking as soon as I put in MT90. Lucky me, I had an excellent German auto mechanic who fixed the problem $100 later in labor and $100 in parts and the shifter and the clutch were so much better...

I frequently drained and refilled (every other year) with RL MT90 and had no transmission failures traveling a fully loaded 86 Jetta cross country at 90MPH.

W115nut
 
The Redline MT 90 will give you great protection.
The only thing left is shifting performance.
Reports are from very good to notchy shifting.
That is why the slightly thinner synchromesh, or one of Specialty Formulations products in the right grade are especially beneficial.
It's nice to have options, though.
 
I would recommend avoiding the thinner fluids such as Synchromesh or SynchroGlide in older Nissan transmissions, and try our MTL-P first and MTL-R second.

If you have the cash and are willing to experiment, try MT90, then MTL, then MT90/MTL, then RP's stuff, then ours, and tell us how each perform.
 
Just for closure, I ended up getting the MT-90 and have had it in my MT for about a month now. It definitely made a difference for the better, and I was feeling like it was the best $28 I have spent on my car. But lately I have developed a problem with my clutch/transmission, and it's looking like I'm going to have to repair one and/or both.

I do not believe it was from the MT-90, but it is very weird that I read this now.
 
Is the clutch slipping?

It's quite possible that the mainshaft seal on the transmission had built up a false seal from its years of dino that the MT-90 promptly dissolved, resulting in a leak. Gear oil and clutch discs don't play well together.

In any event, if you decide to replace the clutch, replace the mainshaft seal on the transmission and the rear main seal on the engine. It adds about $40 to the job and solves two problems that are going to occur sooner or later anyway.
 
Sorry, I posted that last response from my friend's computer.

No the clutch is not slipping. It makes a squeek/whine sometimes when I release the clutch, and it also makes a pretty horrible grinding sound when I downshift sometimes.
 
Please don't think I'm insulting your intelligence when I ask this, but are you sure that the transmission isn't under- or over-filled? Is it possible the car wasn't on level ground when you filled it, or something similar?

Barring that, you might want to convince yourself that it's not the fluid. I would drain the MT-90 into a clean container (make sure it's clean so you can re-use the fluid). Coastal makes an 80W-90 multigrade dino GL3/GL4/GL5 fluid that's fairly cheap (less than $10/gallon). I'm not sure I'd use it long-term, but in the short-term it shouldn't hurt anything.

If your problem goes away, then you know it's a fluid issue.

If there's no difference, just put the MT-90 back in and save the multirated stuff for the next time you change your differential fluid.
 
quote:
Don't use anything GL-5 rated on Nissan manual transmissions. Use GL-4 rated fluids like Redline and Amsoil.
Click to expand...
You CAN use MT specific fluids with GL5/GL4 ratings, such as our MTL-P or -R or RP's fluids.

I would not use any GL5 differential fluid for ANY manual transmission unless it's 5 ton or above truck.
 
I went from SF MTL-R to MT-90 in my 05 Corolla recently, in search of a buttery smooth shift (like the quest for the Holy Grail eh). I had gone from factory fill to a flush of Coastal el-cheapo, to two runs of MTL-R (had a gallon) to the MT-90 last week. I think (and this is a strong 'I think') that the engagement between gears is slightly smoother with the MT-90, like I can shift slightly faster with less 'feeling' between the gears. I only have a couple hundred miles, so I can't say anything definitive yet.
 
Status
Not open for further replies.

Similar threads

2
Redline 75W/90 NS? Subaru WRX STI 6MT/Torsen.
2
Replies
21
Views
1K
kschachn
T
Opti-2 at 92:1?
2 3
Replies
52
Views
923
97prizm
T
Running different OEM MTF’s in other make vehicles
Replies
15
Views
2K
nthach
J
2019 Subaru Crosstrek 6MT transmission fluid
2
Replies
27
Views
3K
ceecbtg
Speedbird001
Motul Multi DCTF or High Torque DCTF for MT82 [Manual] Trans in a 2012 Boss 302?
Replies
3
Views
1K
Speedbird001
Back
Top Bottom