MT-90 from Redline

silver streak · 11-02-2012, 06:04 PM

I changed mine out using redline at 3500 miles due to buying the car with 2500 miles on it and not knowing how hard it had been driven before. I am now feeling somewhat of a light vibration in the stick shifter and pedals. I changed the fluuds myself and feel confident everything was done correctly but have that nagging feeling that maybe just didn't get enough fluids in.any thouhts or is anyone else experiencing this vibration? The car is an 2009 base model w

PHP Code:


			
ith 35k miles.

pty370z · 11-02-2012, 06:18 PM

Actually, the recommended Red Line fluid for the MT 370Z is MT-85.

Mandingo · 11-02-2012, 08:25 PM

Quote:

Originally Posted by pty370z

Actually, the recommended Red Line fluid for the MT 370Z is MT-85.

Correct, but I've now heard from two people that MT-90 performs great in our transmissions. I had Redline's MT-85 in mine and it had a very notchy 1st to 2nd shift. I switched back to OEM mt oil and the notchiness is gone. I wonder if Redline's 85 weight is actually a little thinner than the 85 rating it shows.

Ryan @ RJM · 11-03-2012, 03:19 PM

I've run multiple fluids through my 350Z/G35 and 370ZG37 transmissions for testing including 3 of the Redline MT oils both straight or in mixes.

Here are my observations.

1.) Redline MTL 75W90 straight
Felt good when cold, shifted smooth without notch under normal driving until you pushed it hard. Once the trans started getting hot it would get notchy quick and you could feel slight gear nibble at high RPM before it meshed the next gear. Down shifting was ok but no significant improvement over Nissan fluid.

2.) 50/50 mix MT90 and MTL
A little notchier then straight MTL in the morning for the first few blocks but warmed up quickly giving nice smooth shifts. When pushing hard or on really hot days it maintained its good shifting qualities with very minimal notch at high RPM. Downshifting was much improved once warmed up over MTL or Nissan fluid. Cold downshifting was somewhat worse then stock or MTL.

3.) MT85 Straight - No surprise here it performed pretty much exactly like #2 the 50/50 mix as that is all Redline has done to make its in-between formula.

4.) MT90 Straight-
Much notchier then straight MTL in the morning and takes longer to warm up. The colder it is overnight the worse it’ll be. Once warmed up it shifts like butter. When pushing hard or on really hot days it maintained good shifting no matter how hard you pushed. Downshifting was exceptional once warmed up over MTL or Nissan fluid. While cold the downshifting was much worse then MTL.

I wouldn’t us straight MT90 unless you live where the temperature remains fairly high year round so warmup isn’t as much of an issue or if you track the car regularly. Definitely not for cold weather use.

I’ve also tried the following mixes:
2 quart MTL + 1 quarts MT90 which is not as good as the 50/50 mix.
2 quarts MT90 + 1 quart MTL which is a better alternative for a mainly street driven car then straight MT90.

Now for the not so mainstream answer and for the best shifting fluid I’ve ever come up with for all weather and all purpose use... I mix 1 Quart Redline MT90, 1 Quart Redline MTL and 1 Quart of Amsoil Synthetic Synchromesh Fluid. This mix was tested in both my 06’G35 and my 09’ G37 and the results are like the best of both worlds. No notch when cold, no notch when hot or pushed hard, buttery smooth up shifts and really nice downshifts even if you’re lazy and aren’t rev matching. The synchro’s seem to love it as they quiet down and just all around seem to function faster especially when cold and on downshifts. Also zero grinds and upon draining at 5k miles there was no tell-tale synchro glitter or metal particles to indicate anything other then a healthy transmission.
Take with grain of salt and try at your own risk.

Also before someone asks me about our cars taking 3.2 quarts of fluid I’ve always used 3.0 quarts for changes as unless you leave if to drain for days you’ll never get that last 0.2 of a quart out and the 3.0 has always easily gotten me to the full mark when level… so no need to waste money buying a 4th bottle of fluid.

Mandingo · 11-04-2012, 10:02 AM

Thanks for that very informative post Ryan.

I've only tried MT85 and OEM so far. I was thinking (and this might sound like I'm over-thinking) about mixing MT85 and MT90 to get a ~MT88 type of blend. I already have a few bottles of each laying around so I might just test it out over the holidays.

I believe this may be what you did here, when you say quote:

I’ve also tried the following mixes:
1 quart MTL + 2 quarts MT90 which is not as good as the 50/50 mix.
2 quarts MT90 + 1 quart MTL which is a better alternative for a mainly street driven car then straight MT90.

But it seems like these two blends would be the exact same thing right? They are both 1/3 MTL and 2/3 MT90 fill.

Ryan @ RJM · 11-04-2012, 11:03 AM

Quote:

Originally Posted by Mandingo

Thanks for that very informative post Ryan.

I've only tried MT85 and OEM so far. I was thinking (and this might sound like I'm over-thinking) about mixing MT85 and MT90 to get a ~MT88 type of blend. I already have a few bottles of each laying around so I might just test it out over the holidays.

I believe this may be what you did here, when you say quote:

I’ve also tried the following mixes:
1 quart MTL + 2 quarts MT90 which is not as good as the 50/50 mix.
2 quarts MT90 + 1 quart MTL which is a better alternative for a mainly street driven car then straight MT90.

But it seems like these two blends would be the exact same thing right? They are both 1/3 MTL and 2/3 MT90 fill.

Mandingo you're welcome.
Looks like I goofed typing those mixes though.
They should have read:

2 quarts MTL + 1 quarts MT90 is not as good as the 50/50 mix.

2 quarts MT90 + 1 quart MTL which is a better alternative for a mainly street driven car then straight MT90.

So yes, 2/3 MT90 and 1/3 MTL should give you a little better hot shifting over the MT85 while not being as harsh as MT90 in the morning when cold. While I haven't tried it I'd think the 2qrts MT85 and 1qrt MT90 should be a pretty good combination as well.

11-02-2012, 06:04 PM	#1 (permalink)
silver streak Base Member Join Date: Aug 2011 Location: Sterling, Va./ Va.Beach Age: 60 Posts: 27 Drives: '09 370Z coupe Rep Power: 14	I changed mine out using redline at 3500 miles due to buying the car with 2500 miles on it and not knowing how hard it had been driven before. I am now feeling somewhat of a light vibration in the stick shifter and pedals. I changed the fluuds myself and feel confident everything was done correctly but have that nagging feeling that maybe just didn't get enough fluids in.any thouhts or is anyone else experiencing this vibration? The car is an 2009 base model w PHP Code: `ith 35k miles.` __________________ [B][B]Rich Garrett

11-02-2012, 06:18 PM	#2 (permalink)
pty370z Track Member Join Date: Apr 2009 Location: Panama City, Panama Posts: 654 Drives: over the speed limit Rep Power: 18	Actually, the recommended Red Line fluid for the MT 370Z is MT-85. RBfastback likes this. __________________ 2010 Solid Red 370Z * *Touring-Sport-6MT Black Interior Performance:** STILLEN * BERK * UR * MISHIMOTO * K&N * Z1 * ZSPEED * UPREV * DBA Interior: GT-R Red Start/Stop Button * MSA Floor Mats * PW:JDM Exterior: INGS+1 * SEIBON * FUJIMURA * PW:JDM * UAM * KICS * VOLK

11-03-2012, 03:19 PM	#4 (permalink)
Ryan @ RJM Enthusiast Member Join Date: Aug 2012 Location: Ontario Canada Posts: 345 Drives: 09' G37S Coupe Rep Power: 13	I've run multiple fluids through my 350Z/G35 and 370ZG37 transmissions for testing including 3 of the Redline MT oils both straight or in mixes. Here are my observations. 1.) Redline MTL 75W90 straight Felt good when cold, shifted smooth without notch under normal driving until you pushed it hard. Once the trans started getting hot it would get notchy quick and you could feel slight gear nibble at high RPM before it meshed the next gear. Down shifting was ok but no significant improvement over Nissan fluid. 2.) 50/50 mix MT90 and MTL A little notchier then straight MTL in the morning for the first few blocks but warmed up quickly giving nice smooth shifts. When pushing hard or on really hot days it maintained its good shifting qualities with very minimal notch at high RPM. Downshifting was much improved once warmed up over MTL or Nissan fluid. Cold downshifting was somewhat worse then stock or MTL. 3.) MT85 Straight - No surprise here it performed pretty much exactly like #2 the 50/50 mix as that is all Redline has done to make its in-between formula. 4.) MT90 Straight- Much notchier then straight MTL in the morning and takes longer to warm up. The colder it is overnight the worse it’ll be. Once warmed up it shifts like butter. When pushing hard or on really hot days it maintained good shifting no matter how hard you pushed. Downshifting was exceptional once warmed up over MTL or Nissan fluid. While cold the downshifting was much worse then MTL. I wouldn’t us straight MT90 unless you live where the temperature remains fairly high year round so warmup isn’t as much of an issue or if you track the car regularly. Definitely not for cold weather use. I’ve also tried the following mixes: 2 quart MTL + 1 quarts MT90 which is not as good as the 50/50 mix. 2 quarts MT90 + 1 quart MTL which is a better alternative for a mainly street driven car then straight MT90. Now for the not so mainstream answer and for the best shifting fluid I’ve ever come up with for all weather and all purpose use... I mix 1 Quart Redline MT90, 1 Quart Redline MTL and 1 Quart of Amsoil Synthetic Synchromesh Fluid. This mix was tested in both my 06’G35 and my 09’ G37 and the results are like the best of both worlds. No notch when cold, no notch when hot or pushed hard, buttery smooth up shifts and really nice downshifts even if you’re lazy and aren’t rev matching. The synchro’s seem to love it as they quiet down and just all around seem to function faster especially when cold and on downshifts. Also zero grinds and upon draining at 5k miles there was no tell-tale synchro glitter or metal particles to indicate anything other then a healthy transmission. Take with grain of salt and try at your own risk. Also before someone asks me about our cars taking 3.2 quarts of fluid I’ve always used 3.0 quarts for changes as unless you leave if to drain for days you’ll never get that last 0.2 of a quart out and the 3.0 has always easily gotten me to the full mark when level… so no need to waste money buying a 4th bottle of fluid. Mandingo, 1cleanZ, redline727 and 3 others like this. __________________ Home of the A.F.P. Upgraded Clutch Pedal System. Smoother Launches, Smoother Shifts & Improved Clutch Control Like No Other Pedal Mod You've Experianced Before Guaranteed! Visit www.RJMPerformance.com or Email Ryan@RJMPerformance.com Also Don't Forget to Like us on Facebook www.facebook.com/RJM-Performance Last edited by Ryan @ RJM; 11-04-2012 at 11:05 AM.

11-04-2012, 10:02 AM	#5 (permalink)
Mandingo Track Member Join Date: Nov 2010 Location: Dallas Posts: 625 Drives: '10 370z 6spd Rep Power: 3371	Thanks for that very informative post Ryan. I've only tried MT85 and OEM so far. I was thinking (and this might sound like I'm over-thinking) about mixing MT85 and MT90 to get a ~MT88 type of blend. I already have a few bottles of each laying around so I might just test it out over the holidays. I believe this may be what you did here, when you say quote: I’ve also tried the following mixes: 1 quart MTL + 2 quarts MT90 which is not as good as the 50/50 mix. 2 quarts MT90 + 1 quart MTL which is a better alternative for a mainly street driven car then straight MT90. But it seems like these two blends would be the exact same thing right? They are both 1/3 MTL and 2/3 MT90 fill. __________________ some mods

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