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MT82 fluid??

jsven008

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+1 for Motul Multi DCTF. Better than stock, the shifts are sooo buttery smooth with it. For cold climates though, I would stick with Ford XT-11-QDC since it has very low viscosity. Just remember to get a pump for refilling the transmission.

As a side note, be very careful about running thicker fluids as they can cause excess wear in cold temperatures. Ford changed to a thinner fluid XT-11-QDC for this specific reason.

A few notes on changing the manual transmission fluid since I didn't see this info in any forums. The standard way is to jack the car up on 4 jackstands so it is level and you can easily check fluid levels. But there is an alternative method using 1 jack stand.

1) You don't need to warm the car up to drain fluid. The fluid will drain quickly and perfectly fine in reasonable temperatures. Unless you are draining it in Alaska when it is 0 degrees outside, don't bother warming it up. You'll only end up potentially burning yourself on a hot exhaust or with hot fluid.
2) Putting the car in sixth gear can help refill transmission. If you are having difficulty inserting the fill line into the fill hole, putting the car in sixth gear can help. If you do decide to jack the car up in sixth gear make sure to use wheel chocks. You don't want your car rolling. The parking brake can also help.
3) You don't have to jack the entire car up with 4 jack stands. The standard way is to use 4 jack stands to check the fluid level. But, you can simply jack up the front passenger side and you will be able to reach the drain and fill plugs. The car does not need to be perfectly level. Get the car as level as possible (typically lowest jack stand height). The manual transmission should also fully drain if you start from a level surface and use the lowest jack stand height. To be certain, simply lower the car to ensure it is fully drained. Be sure to put the correct amount back in per the manual (ex. 2.7 quarts or 2.5 quarts for 2024). Do not overfill. Lower the car to perfectly level to verify this. Do not underfill.
4) Use wheel chocks. Whenever jacking the car up, engage the parking brake and use wheel chocks. While this seems like common knowledge, not all new car owners may realize this. This is especially true if you put the car in sixth gear to refill it.
5) Never rely on the car jack alone, use jack stands. While it might be tempting to skip jack stands and just rely on the floor jack, this can be very dangerous. Given all the low quality car jacks out there, instead rely on quality jack stands. You could use the car/floor jack as a backup with jack stands.
6) The correct size for the drain and fill plugs is 8mm. There was a post in a thread which mentioned 5/16" (7.95mm), which is close, but the correct size of the plugs is 8mm. If you don't have 8mm, 5/16" will suffice. As someone mentioned, you will also need an allen wrench since a socket won't fit in the tight space for the fill plug.
7) Torque to 25ft/lbs. Use a bit of blue Lotite.
Make sure you torque the fill and drain plugs to the correct value of 25ft-lb. I'd also clean the threads and add a bit of blue Loctite. Check for leaks afterwards. DO NOT STRIP THE BOLTS.
8) After changing fluid, warm up car before driving. After changing the fluid, fully warm up the car and fluid before driving it. This will allow the new transmission fluid to become less viscous (thinner) and work it's way into all the crevices. It's also good to shift through the gears 1-6 before driving. If you do not complete this step, you may notice the first few shifts are rough.

Last but not least, it's a good idea to use safety glasses and gloves.

One important note, be sure to put the correct amount of fluid back in. It is hard to check if it is underfilled if you use only 1 jack stand.
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jsven008

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One more note, while some of the newer mustangs list a 150k service interval for manual transmission fluid, it's best to change it more often. The 150k interval is more like 150k miles max, under ideal circumstances. If you do track days, live in a hot/humid/dusty environment, or tow anything you should change it more frequently. Motul recommends 30-60k miles, which I think is a good range for standard use. You can change the fluid easily and inexpensively yourself if you want to save a couple hundred dollars. But, I wouldn't wait until 150k if you value your transmission.
 
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jsven008

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It probably doesn't matter. HT is probably thicker viscosity which is good for hot environments. Multi dctf is fine too, I use it.
Be careful about using thicker fluids in the MT-82 especially in cold weather. A lot of the early MT-82 failures in 2011-2012 were partly due to Ford initially using a relatively thick fluid (75w90). This is the reason Ford changed to the thin XT-11-QDC fluid.

Here are the viscosities of some popular MT-82 fluids:

Motul Multi-DCTF:
Viscosity at 40C (104F): 34.7 mm/s
VIscosity at 100C (212F): 7.1 mm/s
Pour Point: -48C (-57F)
Link:
https://azupim01.motul.com/media/motulData/DO/base/multi_dctf_en_fr_motul_45611_20241021.pdf

Ford XT-11-QDC (by Castrol):
Viscosity at 40C (104F): 32.2 mm/s
VIscosity at 100C (212F): 6.3 mm/s
Pour Point: -57C (-70F)
Link:
https://msdspds.castrol.com/bpglis/...4F1BE79802587CD00354C46/$File/wepp-cas5fl.pdf

BG Syncro Shift II:
Viscosity at 40C (104F): 37.85 mm/s
VIscosity at 100C (212F): 7.11 mm/s
Pour Point: -43C (-45F)
Link:
https://www.bgprod.dk/wp-content/uploads/2016/01/792_SPEC.pdf

Redline DCTF:
Viscosity at 40C (104F): 40.72 mm/s
Viscosity at 100C (212F): 8.09 mm/s
Pour Point: -45C (-50F)
Link:
https://www.redlineoil.com/dctf-dual-clutch-transmission-fluid

Street:
If you live in a cold climate I would stick to Ford XT-11-QDC which has the lowest viscosity at 40C as well as a very low pour point of -70F. If you live in a warm climate year around, then Motul Multi DCTF, BG Syncro Shift II or Redline DCTF are thicker and viable alternatives. Regarding cold climates, I evaluated Motul Multi-DCTF for 800 miles and I experienced a few rough shifts in cold weather below 40F. I also see some mixed experiences on BG Syncro Shift II in cold weather. Lastly, I would not recommend using Redline DCTF in cold climates since it is slightly too thick.

Track:
In general, you want the thinnest fluid which provides the lowest transmission fluid temperature. The temperature of the fluid is directly related to the amount of friction (wear) created in the transmission, all other factors equal. So if Fluid A is running hotter than Fluid B under the same conditions (20 min session, 80F, sunny etc), then Fluid A is creating more friction (wear). Start at a slightly thicker fluid like Motul DCTF and then move to a thicker fluid like BG Syncro Shift II and monitor fluid temperatures. For a dedicated track car, some guys may even use plain 75w90.

Perhaps most importantly, never use regular 75w90 gear oil for cold weather as it is far too thick for the MT-82 design and not even remotely close to the Ford spec. There are thousands of 2011-2012 MT-82 transmission failures due partly to Ford's initial use of 75w90 in cold climates.
 
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24 vert

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Be careful about using thicker fluids in the MT-82 especially in cold weather. A lot of the early MT-82 failures in 2011-2012 were partly due to Ford initially using a relatively thick fluid (75w90). This is the reason Ford changed to the thin XT-11-QDC fluid.

Here are the viscosities of some popular MT-82 fluids:

Motul Multi-DCTF:
Viscosity at 40C (104F): 34.7 mm/s
VIscosity at 100C (212F): 7.1 mm/s
Pour Point: -48C (-57F)
Link:
https://azupim01.motul.com/media/motulData/DO/base/multi_dctf_en_fr_motul_45611_20241021.pdf

Ford XT-11-QDC (by Castrol):
Viscosity at 40C (104F): 32.2 mm/s
VIscosity at 100C (212F): 6.3 mm/s
Pour Point: -57C (-70F)
Link:
https://msdspds.castrol.com/bpglis/...4F1BE79802587CD00354C46/$File/wepp-cas5fl.pdf

BG Syncro Shift II:
Viscosity at 40C (104F): 37.85 mm/s
VIscosity at 100C (212F): 7.11 mm/s
Pour Point: -43C (-45F)
Link:
https://www.bgprod.dk/wp-content/uploads/2016/01/792_SPEC.pdf

Redline DCTF:
Viscosity at 40C (104F): 40.72 mm/s
Viscosity at 100C (212F): 8.09 mm/s
Pour Point: -45C (-50F)
Link:
https://www.redlineoil.com/dctf-dual-clutch-transmission-fluid

Street:
If you live in a cold climate I would stick to Ford XT-11-QDC which has the lowest viscosity at 40C as well as a very low pour point of -70F. If you live in a warm climate year around, then Motul Multi DCTF, BG Syncro Shift II or Redline DCTF are thicker and viable alternatives. Regarding cold climates, I evaluated Motul Multi-DCTF for 800 miles and I experienced a few rough shifts in cold weather below 40F. I also see some mixed experiences on BG Syncro Shift II in cold weather. Lastly, I would not recommend using Redline DCTF in cold climates since it is slightly too thick.

Track:
In general, you want the thinnest fluid which provides the lowest transmission fluid temperature. The temperature of the fluid is directly related to the amount of friction (wear) created in the transmission, all other factors equal. So if Fluid A is running hotter than Fluid B under the same conditions (20 min session, 80F, sunny etc), then Fluid A is creating more friction (wear). Start at a slightly thicker fluid like Motul DCTF and then move to a thicker fluid like BG Syncro Shift II and monitor fluid temperatures. For a dedicated track car, some guys may even use plain 75w90.

Perhaps most importantly, never use regular 75w90 gear oil for cold weather as it is far too thick for the MT-82 design and not even remotely close to the Ford spec. There are thousands of 2011-2012 MT-82 transmission failures due partly to Ford's initial use of 75w90 in cold climates.
I live in a climate where it's hot year round. Might have one 30° day with a low of 39 or so in the year... And since it's a convertible, I don't drive it when it's cold... The lowest temps I operate it in are the low 50's and that's rare...predominantly only when hot 70°+ and sunny. I think the 75w90 (maybe something like redline MT90) might offer a better driving experience for my specific situation with regards to the synchro engagement being subpar when warm with the factory fill. Any one with thoughts/previous experience on this?
Cheers,
24 Vert
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