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Red Line (50305) MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL) - 1 Gallon

4.8 4.8 out of 5 stars 1,533 ratings
$90.60 $0.71 per Fl Oz
Save 26% at checkout Shop items
1 Gallon
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Purchase options and add-ons

Material Synthetic
Brand Red Line
Liquid Volume 128 Fluid Ounces
Item Weight 2.27 Kilograms
Recommended Uses For Product Lube

About this item

  • Provides High performance gear protection and longer synchro life
  • Offers quicker shifts, perfect synchronizer coefficient of friction and eliminates notchy shifting, even when cold
  • Recommended for GL-1, GL-3 and GL-4 applications, as well as where most special synchromesh fluids are specified. Safe for brass synchros, as it lacks the reactive sulfurs found in most GL-5 oils that cause damage
  • Satisfies gear oil viscosity requirements of 75W; 80W; SAE 40 10W40 and 15W40 motor oil
  • Excellent for high- and low-mile transmissions and compatible with petroleums and other synthetics
› See more product details

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Red Line (50305) MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL) - 1 Gallon
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Get it May 2 - 6
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Product Description

Redline Oil
Redline Oil
Redline Oil
Redline Oil
Redline Oil
Redline Oil

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Red Line (50305) MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL) - 1 Gallon

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What's in the box

  • MT-90 75W-90 GL-4

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    Price$90.60$90.60$81.03$10.38-7% $43.70
    List: $47.06    		$12.49
    Delivery
    Get it May 2 - 6
    Get it as soon as Thursday, May 2
    Get it as soon as Friday, May 3
    Get it as soon as Thursday, May 2
    Get it as soon as Friday, May 3
    Get it as soon as Thursday, May 2
    Customer Ratings
    4.84.8 out of 5 stars1,533
    4.84.8 out of 5 stars530
    4.94.9 out of 5 stars1,012
    4.84.8 out of 5 stars3,275
    4.84.8 out of 5 stars479
    4.84.8 out of 5 stars5,309
    Value for money
    —
    4.7
    4.6
    4.8
    4.7
    4.7
    Mileage
    —
    4.7
    4.7
    4.8
    —
    4.8
    Sold By
    EZ Automotive
    R/A Hoerr Incorporated
    Edo Performance
    Amazon.com
    Edo Performance
    Amazon.com
    liquid volume
    128 fluid ounces
    1 gallons
    4 quarts
    1 gallons
    64 fluid ounces
    1 quarts
    viscosity
    —
    185
    185
    80W-90
    —
    80W-90
    form
    Fluids,Liquid,Oil
    Oil
    Oil
    Oil
    Oil
    Oil
    material
    Synthetic
    —
    —
    Blend, Blend, Blend, Blend, Blend
    Synthetic
    —
    weight
    2.27 kilograms
    7 pounds
    8 pounds
    0.92 kilograms
    —
    2 pounds

    Looking for specific info?

    Customer reviews

    4.8 out of 5 stars
    4.8 out of 5
    1,533 global ratings

    Customers say

    Customers like the quality, smoothness and noise of the machine lubricant. They mention that it works well, has no issues and that it's the best manual transmission oil money can buy. They are also happy with noise. However, some customers differ on value and grinding.

    AI-generated from the text of customer reviews

    131 customers mention121 positive10 negative

    Customers say the machine lubricant makes shifting smoother and easier. They also mention that it works great in all weather conditions.

    "Excellent for older vehicles(Jeep Cherokee manual transmission). Shifts smooth and shouldn’t corrode synchros." Read more

    "...The fluid held up fantastically, and always shifted smooth and accurately...." Read more

    "...With this, its smooth and so nice when cold...." Read more

    "...Quieted it right down, and now instead of a choppy shift it's smooth as silk. I still don't believe it...." Read more

    110 customers mention107 positive3 negative

    Customers are satisfied with the quality of the lubricant. They mention that it works well, has no issues, and provides superior performance in manual transmission applications. Some say that it will work nicely in the transfer case. Overall, most are happy with the product's performance and recommend it to others.

    "...The fluid held up fantastically, and always shifted smooth and accurately...." Read more

    "It’s working great so far for how I’ve pushed my w58 transmission" Read more

    "...The Red Line MT-LV is significantly more stable, being only five points thinner than this MT-90 when hot, and matching the hot thickness of this..." Read more

    "...Very good reputation." Read more

    37 customers mention34 positive3 negative

    Customers are happy with the oil. They say it's the best manual transmission oil money can buy, great gear oil for a transmission, and excellent for older transmissions and transmissions that have soft metals. Customers also mention that it'll stand the test of time and is perfect for brass syncs.

    "This is without a doubt one of the best oils for manual transmissions. It is expensive but Amazon seems to have the best prices anyway...." Read more

    "...Red line has truly stood the test of time as one of the best manual transmission fluids." Read more

    "Redline gear oils are amazing, My 1986 Nissan 300zx shifts like new again!..." Read more

    "...This is better than factory recommended lube, the manual transmissions are quiet and shift smoothly after using this.. if you have a Jeep YJ or TJ..." Read more

    25 customers mention21 positive4 negative

    Customers like the noise level of the lubricant. They say it makes their manual transmissions quiet and shift smoothly. Some customers also mention that it completely silences their shifts and makes them much smoother.

    "...TL;DR: If you like your manual transmission to shift like butter, quiet, and precise, buy this fluid." Read more

    "...I should have done this immediately after the rebuild. Quieted it right down, and now instead of a choppy shift it's smooth as silk...." Read more

    "...5th gear became massively more quiet. Gl-4, low sulfur for the brass syncronizers only is real. Redline is NOT snakeskin oil...." Read more

    "...the redline worked best with my AX15 made transmission much quieter and smoother. will be buying again after another 30k miles" Read more

    48 customers mention32 positive16 negative

    Customers are mixed about the value of the machine lubricant. Some mention it's great value, the best manual transmission fluid at any price, and well worth it. Others say it'd be smooth shifting but is a little pricey.

    "...at more than twice the price of competing gear oil, I it's still worth every penny as far as I'm concerned. I'll never use anything else again." Read more

    "...After swapping fluid for MT90 I can assure you the fluid is worth every penny...." Read more

    "...A bit pricy but still not as much as a new transmission." Read more

    "...its a but more expensive than the regular stuff but its more than worth the premium, 10/10 would buy again." Read more

    10 customers mention6 positive4 negative

    Customers are mixed about the grinding. Some mention that it makes shifting easier, while others say that it causes gear grinding.

    "...I accidentally shift a bit too quickly, because there's absolutely no grind at all anymore!My TJ isn't a pavement princess...." Read more

    "Top shelf product. Used on a manual trans 2007 Scion tC. 3rd gear was grinding badly, especially when downshifting..." Read more

    "...Once warmed up, 5th gear wouldn't grind anymore, and 3rd gear would only grind if the driver shoved the handle quickly, although the shifter still..." Read more

    "...Much less gear noise, easier to shift and no more grinding going into any gears!" Read more

    Gear fluid for my 90 Toyota Pickup
    5 Stars
    Gear fluid for my 90 Toyota Pickup
    I bought this because as others stated on Toyota forms that this is the best, let me just say that they aren't lying. This fluid almost completely brought my old (245k miles) trans back to life, mind you the previous person neglected it. It would pop outta first, grind going into second and 4th if not shifted JUST right. So now with this fluid change and the shifter bushings replaced this trans runs great compared to what it was lol
    Hide
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    Top reviews from the United States

    Rich
    5.0 out of 5 stars Great product
    Reviewed in the United States on March 27, 2024
    Size: 1 GallonVerified Purchase
    Excellent for older vehicles(Jeep Cherokee manual transmission). Shifts smooth and shouldn’t corrode synchros.
    Helpful
     Report
    TamaJeepGuy
    5.0 out of 5 stars The only manual transmission oil I will ever buy anymore
    Reviewed in the United States on July 10, 2021
    Size: 1 GallonVerified Purchase
    I have used this in three different vehicles over the years.

    First was a heavily modified and tuned 2008 Cobalt SS turbo with the F35 trans. I tracked that car often, including high speed courses, autocross, and the drag strip. The fluid held up fantastically, and always shifted smooth and accurately. I also used the SSlowbalt for my commute at the time, which was 120 miles a day @80-85mph.

    I have since (sadly) sold my SSlowbalt, and mostly drive my wife's previous (now mine) car, a moderately modified and tuned 2012 Cruze Eco with the M32 trans, that we bought brand new. I have used MT90 in that since the first trans fluid change at ~50k (150k miles at the time of writing this, was changed with the same fluid at 100k, and about to do a third change next week.)
    This stuff shifts SO SMOOTH! I wasn't having issues in my Cruze before I swapped the fluid, but I did, and still notice, how much nicer the shifting feels compared to my buddy's 2012 Cruze ECO 6MT. This is 100% worth it. I have driven our Cruze to both US coasts, through 39 states, ontario, and numerous drives back home to Detroit from Lincoln, NE. I also use my Cruze for the occasional autocross event. Just all around smooth and quiet operation.

    I also have this same fluid in my 1999 Jeep Wrangler TJ with 213k at the time of writing this.
    The MT90 smoothed it out to the point where I was worried, because I was so used to that old AX15 shifting like a dump truck, or something haha. But not anymore! Totally smooth, no grinding on faster shifts (1-2 used to grind a bit if I didn't remember I was driving a brick and tried to shift it too fast). Now it doesn't matter if I accidentally shift a bit too quickly, because there's absolutely no grind at all anymore!
    My TJ isn't a pavement princess. I use it for what it was made to do, and I use it a lot. That trans gets a regular workout. It has been about 15k miles since I swapped it.

    TL;DR: If you like your manual transmission to shift like butter, quiet, and precise, buy this fluid.
    2 people found this helpful
    Helpful
     Report
    Benjamin
    5.0 out of 5 stars 1994 R33 GTST/M Approved!
    Reviewed in the United States on March 26, 2024
    Size: 1 GallonVerified Purchase
    There are no words to express how this changed the way my box feels when it's cold (first start up). I used to had to drive for 5-10 mins for my box to become smooth. With this, its smooth and so nice when cold. I also did shifter return springs, new solid shift bushing and cup and now my 30-year-old gearbox feels like my new HiLux gearbox. Recommend. If its R33 GTST its recommended 75W-90 GL4 and 75-140 GL5 (1 gal) for diff (2qt). Take care
    Helpful
     Report
    Cheri Smith
    5.0 out of 5 stars Great fluid
    Reviewed in the United States on March 10, 2024
    Size: 1 GallonVerified Purchase
    Received well and timely. Bought to replace transmission fluid on a 1999 Yukon with the 5.7 vortec coupled with a 4l60e transmission.
    I replaced the A & B shift solenoids, torque converter clutch modulator, 3-2 downshift solenoid, pressure regulator, filter and gasket. Also installed a evil energy 30row oil cooler to replace the stock GM transmission cooler. Haven't seen the fluid temp get above 150 degrees yet. It has only been two or three days thou so Time will tell.
    Helpful
     Report
    Terry H.
    5.0 out of 5 stars Fantastic gear oil!
    Reviewed in the United States on November 11, 2018
    Size: 1 GallonVerified Purchase
    My manual transmission was rather loud in my '99 XJ (Aisin AX15) after a rebuild. I mostly learned to live with it. But then I heard this stuff was worth the extra money and was basically magic. There was no way I was going to believe that kind of hype without hard proof. But I had a credit on Amazon, needed a fluid change anyway, and figured what the heck. WOW. Now I believe the hype. I should have done this immediately after the rebuild. Quieted it right down, and now instead of a choppy shift it's smooth as silk. I still don't believe it. I find myself looking for other uses for it now. In fact, I took what was left in the bottle and put it in a vintage handheld squeeze pump oiler I have. I lube everything with it.

    I can't say that this will solve your whole world, and I have heard of people being less than impressed, especially for the much higher price tag. But for my part, this is great stuff. I don't know what kind of pixie dust they put in there, but at more than twice the price of competing gear oil, I it's still worth every penny as far as I'm concerned. I'll never use anything else again.
    9 people found this helpful
    Helpful
     Report
    Waveyard
    5.0 out of 5 stars Skeptical at first, but I'm sold.
    Reviewed in the United States on September 26, 2022
    Size: 1 GallonVerified Purchase
    There's a lot of snake oil fluids out there, and I was skeptical at first. Sure there's all these good reviews, but the placebo effect is a powerful thing, especially when you already spent your money. Qualities like "smoother shifts" are very subjective.

    In my case, my 80's Toyota would often refuse to go into first gear, or any gear when cold. It's pretty stressful sitting at a green light with a line of frustrated cars behind you, trying to coax the transmission into 1st. This happened at least a couple times per day. I'd learned to accept it. It is an old truck after all. But I figured I'd change the (probably original) transmission fluid and see if it made a difference.

    Spoiler: It absoluley did. After a month, I've only had one reluctant shift into first since the fluid change. Starting cold, it has no issue going into reverse anymore. Its changed the way I drive. I can smoothly shift into gears that wouldve been off limits before due to speed difference. And, while I prefer to focus on the hard stats, I agree that, subjectively, it does "feel smoother"!

    Maybe the old fluid was just too old, and any decent new fluid would do. Maybe it was previously too low due to a weeping shaft seal. But I'll give Redline the benefit of the doubt. What I know for sure is my shifting problems went away, and I enjoy rowing gears more than ever!
    Helpful
     Report
    jamere
    5.0 out of 5 stars W58
    Reviewed in the United States on March 29, 2024
    Size: 1 GallonVerified Purchase
    It’s working great so far for how I’ve pushed my w58 transmission
    Helpful
     Report
    Awesome Customer
    5.0 out of 5 stars Great for brass synchronizer's
    Reviewed in the United States on April 17, 2024
    Size: 1 GallonVerified Purchase
    This is the only older model manual transmission brass synchronizer fluid that I have found that works with minimal ware on my 1988 Jeep YJ. A bit pricy but still not as much as a new transmission.
    Helpful
     Report

    Top reviews from other countries

    Translate all reviews to English
    John
    5.0 out of 5 stars Great product
    Reviewed in Canada on August 11, 2021
    Size: 1 GallonVerified Purchase
    Great product fast shipping
    Report
    Lucio
    5.0 out of 5 stars Il Top
    Reviewed in Italy on February 22, 2024
    Size: 1 GallonVerified Purchase
    Il miglior olio per il cambio del mio Wrangler tj
    Report
    kevin burton
    5.0 out of 5 stars This Gear Oil Literally Changed My Life
    Reviewed in Canada on January 26, 2020
    Size: 1 GallonVerified Purchase
    Well not really, but it brought my transmission back to life on the very first drive after putting it in. I can now get back into first and have almost completely cured my crunch getting into second. All other gears are just fantastic.

    Is it because my transmissions gear oil just hasn't been changed in too long, or is it because this product actually is magic? I'm not sure to be honest, but I will for sure be buying the same thing again next time.

    Bought for 1998 Jeep TJ and have a small amount left over which is also excellent.
    2 people found this helpful
     Report
    Fred Bristow
    5.0 out of 5 stars Great stuff
    Reviewed in Canada on March 11, 2024
    Size: 1 GallonVerified Purchase
    A little pricey but my transmission is smooth like butter. I didn’t even have a problem with how it shifted before and I wasn’t expecting a difference but I can’t deny it shifts better since I’ve used redline.
    Report
    Dave
    5.0 out of 5 stars shipped fast, exactly what i needed
    Reviewed in Canada on January 1, 2021
    Size: 1 GallonVerified Purchase
    good product, would buy again
    Report