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Red Line 50304, MT-90 75W-90 GL-4, Synthetic Gear Oil for Manual Transmission and Transaxles - 1 Quart

4.9 4.9 out of 5 stars 3,209 ratings

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1 Quart

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Material Brass
Brand Red Line
Liquid Volume 0.96
Item Weight 1.7 Pounds

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
  • Excellent for high- and low-mile transmissions and compatible with petroleums and other synthetics
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$24.44 ($0.76/Fl Oz)
Get it as soon as Sunday, Mar 31
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Sold by Edo Performance and ships from Amazon Fulfillment.
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$13.49
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Sold by Slippery Pete Stuff and ships from Amazon Fulfillment.
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$45.27
Get it Mar 29 - Apr 2
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Ships from and sold by R/A Hoerr Incorporated.
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Red Line (50304) MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant - 1 Quart
Red Line (50304) MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant - 1 Quart
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Price$24.44-30% $9.74
List:$13.99
$24.98-9% $23.53
List:$25.99
-6% $10.38
Typical:$10.99
-15% $39.99
List:$47.06
Delivery
Get it as soon as Sunday, Mar 31
Get it as soon as Sunday, Mar 31
Get it as soon as Sunday, Mar 31
Get it as soon as Sunday, Mar 31
Get it as soon as Sunday, Mar 31
Get it as soon as Sunday, Mar 31
Customer Ratings
Value for money
4.7
4.7
4.6
4.8
4.7
Longevity
4.8
4.9
4.8
Mileage
4.7
4.9
4.8
Light weight
4.7
4.6
4.6
Sold By
Edo Performance
Amazon.com
Amazon.com
R/A Hoerr Incorporated
Amazon.com
R/A Hoerr Incorporated
liquid volume
1 quarts
32 fluid ounces
946 milliliters
1 gallons
1 quarts
form
Fluids,Oil
Oil
Oil
Oil
Oil
material
Brass
Synthetic
Blend, Blend, Blend, Blend, Blend
Synthetic
weight
1.7 pounds
0.01 ounces
2 pounds
1.7 pounds
0.92 kilograms

From the brand


Product Description

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

Product information

Technical Details

Additional Information

Warranty & Support

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Red Line (50304) MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant - 1 Quart


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What's in the box

  • MT-90 75W-90 GL-4
  • Looking for specific info?

    Customer reviews

    4.9 out of 5 stars
    4.9 out of 5
    3,209 global ratings

    Customers say

    Customers like the quality and shifting of the gear oil. For example, they say it's the best quality gear oil they can buy, works great, and has no issues. Customers are also impresseded with the smoothness of the shifting, saying it'll make gears shift like butter.

    AI-generated from the text of customer reviews

    362 customers mention345 positive17 negative

    Customers are satisfied with the quality of the gear oil. They mention that it works great, has no issues, and is of excellent quality. Some say that it helps to eliminate grinding issues. Overall, most are happy with their purchase and recommend it to others.

    "For any ax15 or nv3550 jeep transmission there is. Best manual gear oil on market. Smoother shifts. No grinding when go in 2nd and 4th any longer...." Read more

    "...offroad vehicle so it sees some abuse and I have had zero issues running the gear oil. One of the only true GL4 oil left that I have found...." Read more

    "...This is a perfect fluid for Jeep with AX15 transmission. Far better shifting even in cold weather" Read more

    "Probably the best quality gear oil you can buy. Runs smooth and no grinding or slippage.I use this in a 2002 Toyota MR2 and it works very well." Read more

    355 customers mention322 positive33 negative

    Customers find the shifting of their vehicles to be smoother and more precise after using the machine lubricant. They also say the fluid makes shifting gears a lot easier and smoother. Some customers also mention that the fluid quiets down their vehicles and improves shift feel and smoothness. Overall, customers are happy with the performance of their vehicle after using this product.

    "...Best manual gear oil on market. Smoother shifts. No grinding when go in 2nd and 4th any longer. Better then running motor oil by long shot...." Read more

    "...This case requires GL4 gear oil and the MT90 provides the best shifting and smoothness...." Read more

    "...Far better shifting even in cold weather" Read more

    "Probably the best quality gear oil you can buy. Runs smooth and no grinding or slippage.I use this in a 2002 Toyota MR2 and it works very well." Read more

    Best for Tacoma 5spd (2003)
    5 Stars
    Best for Tacoma 5spd (2003)
    2003 toyota tacoma Xtra Cab 4x4 - 2.7L - 5spdChanged all the gear fluids 2x-3x in my 180k mile taco over the past 2 weeks. I let the tcase & trans drain for a couple hours (hot) & it took about 1.3quarts in the tcase and a little over 2.6quarts in the transmission. You could get by with 4 quarts, but I like the feeling of pumping it in until it dribbles out (which took 4quarts point something total; so i'd order 5quarts). And here is what I noticed:1) An average of about 20miles worse mpg on an entire tank of gas compared to synthetic GL5 fluid (in manual transmission and transfer-case)(355miles @ 15.5 gallons vs. 375mi @ 15.5gal)2) Much smoother shifting in manual trans compared to other older gl4 formulas & newer gl5 stuff. The clutch contains a larger friction zone. Now whether this extra smoothness actually causes more wear or not I have no idea.I'm pretty sure, people worried about copper or brass in your syncros or tranny / t-case need not be worried with the gl5 fluids. Most gl5 fluids say safe for brass on the bottle. Having said that - there's an obvious difference between safe for 100k miles and safe for the 400k i'm trying to hit. EDIT: changed my mind. Worth 5 stars. Saw the Walmart fluid after 10k miles. $#%& the Walmart GL-5 especially in hypoid gears. I'm serious... don't be stupid like me. I probably took 10k to 50k off my rear diff life (which I expect 400k out of) by running walmart fluid for 10k miles @ 90 to 105mph. If you're not going above 75mph or towing you might be ok.A word about fluid change intervals just from what I've seen in my truck (toyota recommends 30k miles for all fluids):Rear Diff - 30k is likely a tad long for the rear diff (20-25k feels better) - but I regularly drive thousands of miles at 90mph. If you aren't towing, driving about 80mph, or doing other stressful differential (for hypoid diffs) driving then 30k is probably ok. @ 70k-150k miles the rear diff fluid was black as hell and saturated with fine particulatesFront diff - I barely use 4x4 (maybe 10x a year for 10 miles at a time. There was pretty much absolutely no wear on the front diff fluid in 70k miles.transfer-case - noticeable mechanical wear of oil (splashy - not thick like syrup), minimal particulates, but still good protection in 70k miles (change whenever)transmission - particulates and mechanical wear, decent wear on the fluid in 35k miles (stick with 30k-ish)Hope sharing that experience helps. Best of luck.P.S. - look at your power steering fluid (suck out the reservoir with a turkey baster & put in new stuff - drive & repeat). Ran 110k to 165k on the original ATF in the power steering system. That was risky.
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    Top reviews from the United States

    Reviewed in the United States on March 11, 2024
    Size: 2 QuartsVerified Purchase
    Reviewed in the United States on January 29, 2024
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    Reviewed in the United States on February 12, 2024
    Reviewed in the United States on February 7, 2024
    Size: 2 QuartsVerified Purchase
    One person found this helpful
    Report
    Reviewed in the United States on March 20, 2024
    Size: 2 QuartsVerified Purchase
    Reviewed in the United States on February 10, 2024
    Reviewed in the United States on December 17, 2023
    Size: 2 QuartsVerified Purchase
    2 people found this helpful
    Report
    Reviewed in the United States on December 3, 2023
    Size: 1 QuartVerified Purchase

    Top reviews from other countries

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    jorge mario sicaeros gomez
    5.0 out of 5 stars Recomendado para transmisiones nissan Viejas
    Reviewed in Mexico on August 7, 2023
    Size: 2 QuartsVerified Purchase
    Richard Sharpe
    5.0 out of 5 stars High quality product
    Reviewed in Canada on August 1, 2023
    Size: 1 QuartVerified Purchase
    MARCELINO
    5.0 out of 5 stars Producto apropiado
    Reviewed in Mexico on October 17, 2021
    Size: 1 QuartVerified Purchase
    Tiberio Pedrini
    5.0 out of 5 stars Venditore su cui puoi contare
    Reviewed in Italy on October 19, 2023
    Size: 1 QuartVerified Purchase
    Vanderstraeten
    5.0 out of 5 stars Geen fabeltje
    Reviewed in Germany on April 19, 2022
    Size: 1 QuartVerified Purchase