Redline mt-lv manual trans fluid
#26
Registered
Just bought some (it just arrived into NZ this week ) and went for a before and after test drive ! Cost was $103.00 for 2quarts so it def. aint cheap!
Before : This was on new synthetic oil of recommended viscosity . Initially it was still graunching when downshifting into 2nd but while the oil was relatively cool ............. it wasn't graunching into 4th . Was surprised by this so kept trying and and sure enough ....as the oil heated up it started graunching and got worse and worse.
After : After fully warmed up ..................No more graunching into either gear . The only thing I notice is that it's harder to change up into 4th and downshift into 2nd than it is for the other gears ...but ..................No Graunch !!!!!
True test will be after a few thousand kms to see if the improvement is permanent or not but so far .... I'm very pleased!
Before : This was on new synthetic oil of recommended viscosity . Initially it was still graunching when downshifting into 2nd but while the oil was relatively cool ............. it wasn't graunching into 4th . Was surprised by this so kept trying and and sure enough ....as the oil heated up it started graunching and got worse and worse.
After : After fully warmed up ..................No more graunching into either gear . The only thing I notice is that it's harder to change up into 4th and downshift into 2nd than it is for the other gears ...but ..................No Graunch !!!!!
True test will be after a few thousand kms to see if the improvement is permanent or not but so far .... I'm very pleased!
do you need antibiotics for that?
#27
77 cylinders, 4 rotors...
Thread Starter
Redline mt lv update
Just wanted to update you guys on the MT-LV fluid in my car.
It got hot here recently (110 degrees+) and the fluid continues to perform well. I have about 13-14k miles on it now, and it still shifts great.
Still shifts better hot than cold, even with this low viscosity fluid and the AZ heat.
Like I said, the bearings and the gears might not be OK with this long term, but the syncros certainly seem happy.
It got hot here recently (110 degrees+) and the fluid continues to perform well. I have about 13-14k miles on it now, and it still shifts great.
Still shifts better hot than cold, even with this low viscosity fluid and the AZ heat.
Like I said, the bearings and the gears might not be OK with this long term, but the syncros certainly seem happy.
#29
77 cylinders, 4 rotors...
Thread Starter
#31
Registered
Royal purple is what I have in my trans. I like it. It shifts nice and I find my cup holders don't get warm anymore.
#32
No respecter of malarkey
iTrader: (25)
A lot of people ended up with bad synchros with RP, never been a fan of anything they offer and never tried it myself
was talking to a guy that specializes in rebuilding these transmissions for racing and he’ll only warranty the Ford Motorcraft XT-M5-QS oil.
was talking to a guy that specializes in rebuilding these transmissions for racing and he’ll only warranty the Ford Motorcraft XT-M5-QS oil.
#33
Registered
Rp is the best I could find local at the time. What do you recommend for diff team?
#34
Smoking turbo yay
I have had a bad experience with Ford Motorcraft XT-M5-QS, but also I am the only person that seems to have issues with it.
Had it in my 8 for like a year, daily driven with about 2~3 AutoX events. It started to get notchy towards the end, and I ground my 2nd gear twice with the clutch all the way in. When I changed out the fluid, it was pitch black and my buddy noted a burnt smell as well when we were changing it. I changed to Motul Gear 300 and it was pretty good.
I used Motul Gear 300 LS in the diff, though supposedly the standard Gear 300 is fine as well since it meets both GL-4 and GL-5, and the LS diff fluid is supposedly more designed for clutch-type LSD.
Had it in my 8 for like a year, daily driven with about 2~3 AutoX events. It started to get notchy towards the end, and I ground my 2nd gear twice with the clutch all the way in. When I changed out the fluid, it was pitch black and my buddy noted a burnt smell as well when we were changing it. I changed to Motul Gear 300 and it was pretty good.
I used Motul Gear 300 LS in the diff, though supposedly the standard Gear 300 is fine as well since it meets both GL-4 and GL-5, and the LS diff fluid is supposedly more designed for clutch-type LSD.
#37
Registered
i am also having issues with Ford Motorcraft XT-M5-QS. Trans shifted well prior. I've missed 2nd upshifting at a couple autocrosses, which is extremely rare for me, and doing slow deliberate downshifts on a road course resulted in grinds. never had those issues with MT90. i think i will go back to redline and assess.
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Jedi54 (12-21-2021)
#38
I had similar issues with Motorcraft on my S2. Motul DCTF was significantly better. New trans has OEM fluid in it and it's utterly useless, so I'm likely to try the Redline as well. Thanks for the info guys!
#39
“Whale-oil-beef-hooked”
I tried the Ford fluid and was rarely able to get enough heat in the transmission fluid to have good shifting results. My car hasn’t seen a track yet with me behind the wheel. Much better shifting with the Redline fluid. Shift to second gear with the Ford fluid was an exercise in patience. Don’t have that with the Redline.
#40
77 cylinders, 4 rotors...
Thread Starter
I will add this also. I just got my other RX8 running, a 2007 with the original trans at 186,000 miles, when I put the car away the tranny had rough synchros, (grinding) in 2nd and 5th. I did not think the tranny would last too long, since the shifting really sucked. I put the MTLV in and immediately second was fine, I could upshift as quickly as needed, which is quick, with a RB light flywheel, to try to be smooth. 5th still grinds at the moment, but only on downshifts, and only when cold. When warm, there is no abnormal behavior. In the original tranny (early s2 in a 2004) I used this in, the shifting has actually gotten better over time, maybe because the fluid has thinned a bit, or maybe because the synchros have "relapped" to a certain extent, I don't know. So far a great result. I would love to see someone use this at a track day, to see if it holds up as well as it does on the street. I think I am approaching 40k on the first fill of MTLV. I will change it soon, and see if any difference is noted with fresh fill.
#41
77 cylinders, 4 rotors...
Thread Starter
More Info
I have just over 5k miles with MT-LV on the second rx8 with the s1 box, and the 5th gear cold downshift grind is gone. All shifts seem to be improving, and rev match on upshift is easy even with RB flywheel. This on a s1 box with over 190,000 miles on it. I noticed on the other 8 (with s2 box) the shifting improved over time, I thought maybe it was an illusion, or viscosity change after so many miles, etc, but it seems like it helps weak synchros the more miles stack up. I would like to hear if others noticed same.
#42
Smoking turbo yay
I tried the Ford fluid and was rarely able to get enough heat in the transmission fluid to have good shifting results. My car hasn’t seen a track yet with me behind the wheel. Much better shifting with the Redline fluid. Shift to second gear with the Ford fluid was an exercise in patience. Don’t have that with the Redline.
Redline is generally regarded as good stuff but my experience with it is very limited. I had good results with Amsoil and Motul. I used Amsoil in my Accord(Manual Synchromesh Transmission Fluid) in Alberta and now Camaro(Signature Multi-ATF, and yes it's a manual trans, TR-6060 is just a little weird like that), and Motul in my RX-8(Gear 300) and now my Mazda3(Motyl Gear, which is semi-synthetic but it's good enough for a family car like that).
#43
Boosted Kiwi
iTrader: (2)
I have just over 5k miles with MT-LV on the second rx8 with the s1 box, and the 5th gear cold downshift grind is gone. All shifts seem to be improving, and rev match on upshift is easy even with RB flywheel. This on a s1 box with over 190,000 miles on it. I noticed on the other 8 (with s2 box) the shifting improved over time, I thought maybe it was an illusion, or viscosity change after so many miles, etc, but it seems like it helps weak synchros the more miles stack up. I would like to hear if others noticed same.
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kevink0000 (03-01-2022)
#45
I did the Motul DCTF again in my S2 instead of the factory fill and it completely fixed my "doesn't want to shift when it's cold" issues.
#48
77 cylinders, 4 rotors...
Thread Starter
A quick update:
On the blue RX8 that now has 210k miles on the original 6MT, the 5th gear grind is still gone when tranny is cold. It dipped into the 20s here and still have excellent shifting hot or cold. Over time just like in my other RX8 trans, the shifting actually improves with time. 25k miles now on this fill in a 210k mile box.
Again,
I tried Motul 300v
Redline MTL
Redline MT-90
Ford XT-QS (or whatever)
And I think another oil I can't remember, and this has been by far the best.
On the blue RX8 that now has 210k miles on the original 6MT, the 5th gear grind is still gone when tranny is cold. It dipped into the 20s here and still have excellent shifting hot or cold. Over time just like in my other RX8 trans, the shifting actually improves with time. 25k miles now on this fill in a 210k mile box.
Again,
I tried Motul 300v
Redline MTL
Redline MT-90
Ford XT-QS (or whatever)
And I think another oil I can't remember, and this has been by far the best.
#49
77 cylinders, 4 rotors...
Thread Starter
Update,
First drain on the mt-lv fluid at 45k miles. Shift quality had degraded slightly over the last 5k or so in the 230k mile plus s1 box. In the future I will drain this at 35-40k. The new fill brought back the smoothness completely. Magic.
With the old fluid, shifting felt more notchy and mechanical, but shift speed and synchro action was not changed. Still could not beat the synchro, hot or cold, at any rpm. I will send off a sample for UOA for kicks and will post it here.
The magnet had low debris. The oil itself still smelled new and was still clear.
First drain on the mt-lv fluid at 45k miles. Shift quality had degraded slightly over the last 5k or so in the 230k mile plus s1 box. In the future I will drain this at 35-40k. The new fill brought back the smoothness completely. Magic.
With the old fluid, shifting felt more notchy and mechanical, but shift speed and synchro action was not changed. Still could not beat the synchro, hot or cold, at any rpm. I will send off a sample for UOA for kicks and will post it here.
The magnet had low debris. The oil itself still smelled new and was still clear.
Last edited by kevink0000; 08-17-2023 at 01:11 PM.
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Brettus (08-17-2023)
#50
Watching. I filled mine with Amsoil about a year ago, and sixth gear synchro, of all gears, complains if I don't rev match it from above (bizarre behavior). I'll be changing fluids before next season for sure.