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Old 12-06-2009, 11:29 AM   #1
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Default Redline MTL, Honda MTF, or GM/ACDelco Synchromesh Fluid?

im effin overdue on a trans flush, any one got suggestions on what is the best fluid?
doing it on my EJ8.

i hear a lot of good things about the Synchromesh "friction modified".. but what about compared to the Honda MTF or Redline MTL fluid? any/all input is appreciated.
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Old 12-06-2009, 12:03 PM   #2
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Default Re: Redline MTL, Honda MTF, or GM/ACDelco Synchromesh Fluid?

Torco MTF
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Old 12-08-2009, 05:43 AM   #3
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Default Re: Redline MTL, Honda MTF, or GM/ACDelco Synchromesh Fluid?

The only thing about the torco mtf is that it will not work too well with synchros that are old and getting worn out. I put it in my own car and it started grinding 3rd gear immediately.
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Old 12-16-2009, 09:53 AM   #4
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Default Re: Redline MTL, Honda MTF, or GM/ACDelco Synchromesh Fluid?

honda mtf or vavoline 5w30 with 80w90 works on my DD and Drag car and my buddies K24 runs 10.80's
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Old 12-16-2009, 10:09 AM   #5
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Default Re: Redline MTL, Honda MTF, or GM/ACDelco Synchromesh Fluid?

Quote:
Originally Posted by Aquafina View Post
Torco MTF
x2. I was a firm believer in Honda MTF, until I tried this stuff. Shifting is definitely much smoother.
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Old 12-18-2009, 02:07 AM   #6
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Default Re: Redline MTL, Honda MTF, or GM/ACDelco Synchromesh Fluid?

Quote:
Originally Posted by mike@synapse motorsport View Post
The only thing about the torco mtf is that it will not work too well with synchros that are old and getting worn out. I put it in my own car and it started grinding 3rd gear immediately.
This can be seen as a good thing

If the synchros are old and worn out, it's time to replace them. I would never recommending masking the problem by just changing tranny fluid.
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Old 12-18-2009, 10:16 AM   #7
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Default Re: Redline MTL, Honda MTF, or GM/ACDelco Synchromesh Fluid?

I had AMSoil synchromesh 5w30 in a gsr trans from HMO, the trans grinded like a month after I got it installed, I'm not very happy at all, I drained the fluid like 7,000 miles later and the fluid was very black.. I switched to royal purple and it'd not doing much of anything either..

I'm leaning towards torco or redline
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Old 12-22-2009, 09:19 AM   #8
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Default Re: Redline MTL, Honda MTF, or GM/ACDelco Synchromesh Fluid?

honda oem mtf.

the other thicker stuff is good but should be used for high hp cars i think. mainly for gear protection.

i used the redline for a while and noticed it needs to warm up a little longer before it goes into the gears better. also i had problems grabbing 3rd at the track with the redline stuff so i switched back to the oem mtf and caught each shift perfect everytime.

oh and them oem mtf is cheaper. lol.
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Old 12-29-2009, 03:28 PM   #9
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Default Re: Redline MTL, Honda MTF, or GM/ACDelco Synchromesh Fluid?

I heart Redline Lightweight SHockproof in the straightcuts... Except cleaning it up... LOL...
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Old 02-12-2011, 01:13 PM   #10
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Default Re: Redline MTL, Honda MTF, or GM/ACDelco Synchromesh Fluid?

so whats god for daily driving an occasion spirited driving?
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Old 02-12-2011, 06:07 PM   #11
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Default Re: Redline MTL, Honda MTF, or GM/ACDelco Synchromesh Fluid?

Torco MTF. RTF if you don't mind the expense.
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Old 02-13-2011, 08:13 AM   #12
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Default Re: Redline MTL, Honda MTF, or GM/ACDelco Synchromesh Fluid?

Quote:
Originally Posted by smoov_w4gon View Post
so whats god for daily driving an occasion spirited driving?
For a daily driver I recommend Genuine Honda MTF.

For the track use Torco MTF.
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Old 02-21-2011, 04:20 AM   #13
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Default Re: Redline MTL, Honda MTF, or GM/ACDelco Synchromesh Fluid?

Guys, just keep in mind when selecting a syncro fluid, it's not just a matter of brands (additive chemistry) but also a matter of weight. Syncro fluids go from ATF-thin stuff all the way up to 90 weight gear oils. Here's a list of brands and their weight in centistrokes (cSt) at 100C/212F :


ATF type: 6.0 – 7.5 typical
Honda MTF II 7.5
Royal Purple Synchromax 7.7

GM/Chrysler Synchromesh type: 8.5-10.0 typical
Torco MTF 8.35
Pennzoil Syncromesh: 9.08
Amsoil MTF (5W-30) 9.6
Red Line Oil MTL 10.6
Honda MTF I 10-11?

75W-85 Gear Oils: 12.0-12.5 typical
Specialty Formulations MTL-P 12.0-12.5
Castrol Syntorq 75W-85 12.0???
Nissan 75W-85 12.0???

90 weight Gear oils: 15-16.5 typical
Chevron Delo 80W-90 14.2
Royal Purple Max Gear 14.5 (Published: 21)
Amsoil MTG 14.7
Mobil 1 75W-90 15.2
Pennzoil GL4 75W-90 15.3
Red Line Oil MT-90 15.6

The list is a bit dated ... there are a few newer fluids I have not bothered to add.
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Old 01-14-2012, 04:33 PM   #14
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Default Re: Redline MTL, Honda MTF, or GM/ACDelco Synchromesh Fluid?

What about the honda mtf III ???
Also have any other GL-6 rated oils like richmond gear lube been tested in a honda?
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Old 01-14-2012, 08:49 PM   #15
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Default Re: Redline MTL, Honda MTF, or GM/ACDelco Synchromesh Fluid?

The end all trans fluid thread.
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Old 01-14-2012, 09:25 PM   #16
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Default Re: Redline MTL, Honda MTF, or GM/ACDelco Synchromesh Fluid?

so....you guys would recommend torco mtf stock ls tranny, but usally revs around 5-6 sometimes tough to shift in to 2nd gear no grinding, im doing a flush next week where would i buy this stuff?
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Old 01-14-2012, 11:01 PM   #17
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Default Re: Redline MTL, Honda MTF, or GM/ACDelco Synchromesh Fluid?

Quote:
Originally Posted by MR.johnson View Post
another pointless thread...also another thing that needs to be pointed out is the people saying 75w80 75w90 etc gear oil is to heavy of an oil....little do they know this is about equal to a SAE 10w30 rated motor oil. Honda mtf is "mtf spec" mtf-7289 and made by chevron/texaco and is a gl-4 70w80 gear oil. Then honda came out with the MTF II which was very "thin" compared to the original MTF and they also have MTF III which has much higher viscosity then either and is about on par with a 75w90 gear oil or SAE 10w40 motor oil.

i would like to know if anyone has tried the new honda mtf-3 or any of the newer gl-6 oils (another thing to point out is there is no such thing as gl-6 anymore...gl-1 gl-2 gl-3 and gl-6 ratings were discontinued in 1995) but people can still make and sell oils under those API ratings. (even though there is no governing body that will test to ensure those ratings are accurate)
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Old 01-15-2012, 08:42 AM   #18
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Default Re: Redline MTL, Honda MTF, or GM/ACDelco Synchromesh Fluid?

We have use RedLine in a variety of vehicles and can not think of a single instance where it didn't make the vehicle shift better from Porsche Cuppes to even a beater Toyota 4Runner with auto to manual box swap - talk about extremes from racing to street!
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Old 01-16-2012, 12:24 AM   #19
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Default Re: Redline MTL, Honda MTF, or GM/ACDelco Synchromesh Fluid?

Quote:
Originally Posted by DER MotorSports View Post
We have use RedLine in a variety of vehicles and can not think of a single instance where it didn't make the vehicle shift better from Porsche Cuppes to even a beater Toyota 4Runner with auto to manual box swap - talk about extremes from racing to street!
Try it in a Honda, report back when bearing cages fail.
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Old 01-16-2012, 04:42 AM   #20
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Default Re: Redline MTL, Honda MTF, or GM/ACDelco Synchromesh Fluid?

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Try it in a Honda, report back when bearing cages fail.

IDK Bone, Redline LW SP works great in mine.... H's have steel cages, BUT i have also replaced counter bearings with plastic caged honda OEM replacements (not sure as to the rhyme or reason to why sometimes you get plastic and sometime steel when ordering the same part number)...

Never had a problem. Then again, getting the trans up to temp (IE warming the car up) probably helps I would think ...
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Old 01-16-2012, 05:34 AM   #21
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Default Re: Redline MTL, Honda MTF, or GM/ACDelco Synchromesh Fluid?

We have and no issues. Maybe our guys aren't using as hard as yours? Under what conditions are you experiencing failure? How built are the cars? How are they used? None of our guys drag race if that is the circumstance. Also, none of our guys are pulling 500+WHP (by far I am the highest with mid 400s).
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Old 03-07-2013, 02:14 PM   #22
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Default Re: Redline MTL, Honda MTF, or GM/ACDelco Synchromesh Fluid?

Quote:
Originally Posted by Bror Jace View Post
Guys, just keep in mind when selecting a syncro fluid, it's not just a matter of brands (additive chemistry) but also a matter of weight. Syncro fluids go from ATF-thin stuff all the way up to 90 weight gear oils. Here's a list of brands and their weight in centistrokes (cSt) at 100C/212F :


ATF type: 6.0 – 7.5 typical
Honda MTF II 7.5
Royal Purple Synchromax 7.7

GM/Chrysler Synchromesh type: 8.5-10.0 typical
Torco MTF 8.35
Pennzoil Syncromesh: 9.08
Amsoil MTF (5W-30) 9.6
Red Line Oil MTL 10.6
Honda MTF I 10-11?

75W-85 Gear Oils: 12.0-12.5 typical
Specialty Formulations MTL-P 12.0-12.5
Castrol Syntorq 75W-85 12.0???
Nissan 75W-85 12.0???

90 weight Gear oils: 15-16.5 typical
Chevron Delo 80W-90 14.2
Royal Purple Max Gear 14.5 (Published: 21)
Amsoil MTG 14.7
Mobil 1 75W-90 15.2
Pennzoil GL4 75W-90 15.3
Red Line Oil MT-90 15.6

The list is a bit dated ... there are a few newer fluids I have not bothered to add.
What weight would allow for faster shifting in competition use, both for new, and for worn synchros?
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