Manual transmission fluid type.

[Optimum Performance]

Good question, and something I missed. Yes, I specifically asked about the 3160. Thanks @murick

Until a few years ago, before Tremec released their own transmission oil, they recommended ATF for most of their product line. ATF's are not the best for manuals with gears due to the metal to metal contact.

Tremec HP MTF has a Viscosity Rating of 12.1 @ 100C (212F) or 71.6 @ 40C 104F)
OEM Motorcraft Mercon LV has a Viscosity Rating of 6.0 @ 100C (212F) or 29.6 @ 40C 104F)
BG Syncro Shift II has a Viscosity Rating of 7.11 @ 100C (212F) or 37.85 @ 40C 104F)

We have invested thousands of dollars sampling fluids. We sample random bottles of our BG products just to keep everyone honest. We use Lake at SPEEDiagnostix for most of our testing now, previously we have sampled some of the popular fluids with Jet-Care as blind samples.

Straight BG Syncro Shift II Tested as 7.1 @ 100C (212F) or 38 @ 40C 104F)
2.7 Quarts of BG SS II with 6oz MGC Tested as 7.4 @ 100C (212F) or 42 @ 40C 104F)

Tremec has almost always recommended ATF type fluids (or the BG Sourced GM Synchromesh) and since the release of their own MTF with higher viscosity, that line has really blurred.

In discussions with the engineers at BG, the shifting performance comes from the ability of the fluid to get out of the way of the synchro's and have the proper friction level for the film to speed match the gear sets during a shift. We have explored other products that BG offers that have a higher viscosity but were cautioned from using them in anything but a very high load/high heat application (wheel to wheel racing) so we never offered it. The SS II seems to work well for most applications.

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[SheepDog]

Redline D4 is another good option. I've been running this for about 8,000 miles. Silky smooth engagement, cold or hot. Interesting that TREMEC calls for either Dexron II or Dexron VI, which have fairly different viscosities.

 

[RobZ71LM7]

Redline D4 is another good option. I've been running this for about 8,000 miles. Silky smooth engagement, cold or hot. Interesting that TREMEC calls for either Dexron II or Dexron VI, which have fairly different viscosities.

I read the same. FWIW, Redline D4 is a replacement for Dexron III (or II) and D6 is the replacement for Dexron VI or Mercon LV. I'm trying out D4.

 

[GrabberBargeCaptain]

Motul DCTF made mine with MGW shifter shift like buttah.

 

[Esset]

I can recommend Amsoil ATF Signature Series Multi-Vehicle, which I’ve been using since the first change.

 

[skinnyb]

Signature ATF

Same. I didn't take a pic but that is what I used...

 

[Gregdd]

Fluid showed up in a day ups ground so went ahead and changed this morning before work. Only drained 2.5 quarts, suspect have to do it again to get all the old stuff out ? I changed it cold with the car level. There was metal in the oil, could see a silver tint. Glad i went ahead and changed. Also i recomend getting a 1.5 inch extension for the fill plug.

 

[LCK22GT]

Fluid showed up in a day ups ground so went ahead and changed this morning before work. Only drained 2.5 quarts, suspect have to do it again to get all the old stuff out ? I changed it cold with the car level. There was metal in the oil, could see a silver tint. Glad i went ahead and changed. Also i recomend getting a 1.5 inch extension for the fill plug.

I just swapped out the factory fluid with BG Syncro Shift II today. I drained a bit over 3 quarts hot and level and filled the same amount. Then it started raining so no results to report.

 

[Gregdd]

After driving the car last night I was very happy with the results after the fluid change to amsoil. Will have to wait and see how it does when it gets cold out.
I plan to change it a second time just to clear out most of what was left in the oil cooler. No idea how long I should wait. Does anyone know if the pump circulates the oil in the cooler all the time ?

 

[Esset]

No, the temp must be high to set the pump on.

See https://www.mustang6g.com/forums/th...-how-to-run-pump-with-forscan-no-pids.218747/

 

[murick]

No, the temp must be high to set the pump on.

See https://www.mustang6g.com/forums/th...-how-to-run-pump-with-forscan-no-pids.218747/

I believe for what concerns the transmission fluid change, and in particular the variant with the cooler, the emptying should be done automatically, and the filling should follow the procedure described in the user manual. Which suggests that you should be able to fill the cooler with the "cold" fluid as well.

 

[Gregdd]

Thanks for all the replys.. Probably will just wait and change again at next oil change. I am happy with how it shifts with the new fluid.​

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