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View Poll Results: Which MTF Smoothed out your 6-speed
Mopar MTF 1 16.67%
Pennzoil Synchromesh 1 16.67%
Royal Purple Synchromax 1 16.67%
MTL Red Line 2 33.33%
Amsoil Synchromesh 1 16.67%
Quaker State Synchromesh 0 0%
Valvoline MTF 0 0%
Other / Blend 0 0%
Voters: 6. You may not vote on this poll

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Old 10-07-2018, 08:37 PM
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6-Speed Trans Fluid (POLL)

I recently ran into the problem of an underfilled manual transmission. It was at least half a quart or so low. I topped it off with some Pennzoil Synchomesh to keep it happy for a bit. It's getting a little cold in Chicago however so it's grinding into 2nd unless I really shove it into gear and the transmission warms up from a nice highway run. I read into a few threads finding a better MTF to remedy this but got very little info into long term results. Please let me know:

1. Which of these MTF's you are using SUCCESSFULLY in the poll

2. Estimated change interval (mileage)

3. Estimated time when you first discovered shifting problems (mileage)

4. Optional: If unsuccessful, when problems started coming back (mileage)

5. Optional: Was the transmission underfilled?

6. Optional: Current odo reading

Thank you advance for your help as well as some data to help me and potentially others find their solution on the forum.

Mod note: This same poll is also in the tech forum. The other can be deleted if rules are violated.

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Old 10-07-2018, 08:46 PM   #2
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I use Redline MTL, works great for me.

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Old 10-07-2018, 10:31 PM   #3
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Quote:
Originally Posted by Leadnut View Post
I use Redline MTL, works great for me.
Mine was under-filled as well from the factory (new). One of the first things I did when I got it home was to drain and replace the oil. I used MTL in my earlier JK to benchmark it against AMSOIL, and found that AMSOIL had a SLIGHT edge as observed by better shifting performance. Therefore, I am sticking with AMSOIL.

If you do switch brands, avoid mixing oils to the best extent possible so as to avoid any chemical incompatibilities between brands.
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Old 10-07-2018, 11:51 PM   #4
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Quote:
Originally Posted by Cyrojeep View Post
I used MTL in my earlier JK to benchmark it against AMSOIL, and found that AMSOIL had a SLIGHT edge as observed by better shifting performance. Therefore, I am sticking with AMSOIL.

If you do switch brands, avoid mixing oils to the best extent possible so as to avoid any chemical incompatibilities between brands.
I hear ya, use what works best for your transmission. I use Amsoil in my diffs and plan to stick with that. My transmission is so smooth with MTL that I don't want to mess up a good thing. The MTL made an immediate difference, but it got even better as miles went on.
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Old 10-09-2018, 09:10 PM   #5
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If this is helpful...it looks like neck and neck between MTL and Amsoil in terms of fluid composition....

https://www.bobistheoilguy.com/forum...Number=1647529
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