---
product_id: 7824058
title: "50305 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL) - 1 Gallon"
brand: "red line"
price: "€ 187.41"
currency: EUR
in_stock: true
reviews_count: 11
category: "Red Line"
url: https://www.desertcart.com.cy/products/7824058-50305-mt-90-75w-90-gl-4-manual-transmission-transaxle
store_origin: CY
region: Cyprus
---

# reduces shift lag & notchy feel 75W-90 synthetic gear oil protects brass synchros & gears 50305 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL) - 1 Gallon

**Brand:** red line
**Price:** € 187.41
**Availability:** ✅ In Stock

## Summary

> ⚙️ Shift like a pro, protect like a boss.

## Quick Answers

- **What is this?** 50305 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL) - 1 Gallon by red line
- **How much does it cost?** € 187.41 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.cy](https://www.desertcart.com.cy/products/7824058-50305-mt-90-75w-90-gl-4-manual-transmission-transaxle)

## Best For

- red line enthusiasts

## Why This Product

- Trusted red line brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **DIY-Friendly Packaging:** 1-gallon bottle with easy fill ports—perfect for professional-grade maintenance at home.
- • **Versatile Compatibility:** Ideal for GL-1, GL-3, and GL-4 specs, safe on brass synchros unlike typical GL-5 oils.
- • **Advanced Gear Protection:** Formulated to extend synchro life and safeguard manual transmissions from wear.
- • **Trusted Legacy Performance:** Red Line’s proven formula since 1979 delivers unmatched durability and reliability.
- • **Ultra-Smooth Shifting Experience:** Eliminates notchy, grinding shifts even in cold temps for buttery gear changes.

## Overview

Red Line 50305 MT-90 is a premium 75W-90 synthetic manual transmission and transaxle lubricant designed for GL-1, GL-3, and GL-4 applications. It ensures ultra-smooth shifting, extends synchro life, and protects brass components by eliminating reactive sulfurs found in GL-5 oils. Trusted by enthusiasts and professionals alike since 1979, this 1-gallon formula is perfect for high-performance and daily-driven manual transmissions, delivering reliable gear protection and superior cold-start shift quality.

## Description

Buy Red Line 50305 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL) - 1 Gallon: Gear Oils - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: 1st gen tacoma gold - 2003 Toyota Tacoma 2.7L - 4x4 - 5spd manual Box was well packaged and sealed in a plastic bag (think mine was double layer plastic). By far the best fluid to run in the manual transmission and transfer case. Seriously avoid supertech (walmarts fluid - especially in the differentials). The first time I put this in, I did a flush with walmarts cheap sythentic fluid (75w-90 supertech) for 200miles just to make sure all the metal was out. I would not recommend more than 500 to 2,000 miles on supertech. With supertech synthetic, I accidentally ended up putting 7000 miles on the rear differential which is a higher torque spindle-type differential in most trucks and the temps were incredibly bad. > 180F @ regular 90mph. Really you shouldn't take most spindle type differentials above 75-80mph because of the wear. With amsoil the rear diff dropped down to 120 for the first 15miles and then around 140 at 90mph. - this is with outside temps of 85+. No more steel flaking and rusting. I'd use amsoil in the transfer case and manual transmission but it's not as good as this stuff at the varying temps. + the transmission doesn't get hot like a rear diff with 210,000 miles. And the transfer case barely sees any speed or wear even at the highest mphs. Thank god for brass. Drain bolts are 24mm. I used a tekton 2ft breaker bar and a shallow 24mm socket. Also bought the u-joints for ratchets just in case. Best fluid (lowest temps & smooth) I've found for the differential is amsoil severe gear 75-110 (yes I know the manual calls for 75w-90). Also, 75w-140 has very weird properties. So bigger numbers are not always better. Used valvoline dextron VI for power steering, which is meh after 10k miles. Will change to amsoil. Mobile1 seems best in the engine from a cost and wear perspective. I usually get pennzoil full synthetic because mobile1 is sold out. Pennzoil is nearly as good for the first 3,500 then seems to degrade much faster. Every truck varies. My rear differentials were probably neglected from the previous owner and exceeding the payload rating numerous times or perhaps someone possibly did not try too hard to get the perfect backlash / etc from the factory. These are my recommended milage drain marks: 15,000-25,000 rear diff 30,000+ front diff (will likely look good for you) 25,000 transmission 40,000-60,000 transfer case (unless this takes you years as in acid is more of a factor than viscosity) 30,000 for power steering 7,000 for engine Brake fluid 2 years if you dare :p Save yourself $150-$400, help your car, and buy the good fluid and do the transmission, transfer case, and rear differential yourself. It's easier than an oil change. No filter required. Fill ports offer idiot proof over/under filling assuming you're on level ground. I do it in the walmart parking lot with a 7qt oil container. Some brake cleaner. Scotts shop towels. Gloves (yes plz). Some empty distilled water containers. And a funnel. Might need a partner to hold the empty containers up while you pour the used oil. The front differential requires 10mm and 12mm hex to ratchet attachments and is much more tricky to access. Worth it though. :)
Review: The only manual transmission oil I will ever buy anymore - 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.

## Features

- HIGH PERFORMANCE - gear protection and longer synchro life. Recommended for GL-1, GL-3, and GL-4 applications.
- QUICKER SHIFTS - perfect synchronizer coefficient of friction and eliminates notchy shifting, even when cold
- REQUIREMENTS - gear oil viscosity of 75W; 80W; SAE 40 10W40 and 15W40 motor oil
- POPULAR GEAR OIL 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
- WHY RED LINE - Established in 1979, Red Line Products perform & protect better than any on the market. No compromises.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B002INX20C |
| Best Sellers Rank | #5,935 in Automotive ( See Top 100 in Automotive ) #8 in Gear Oils |
| Brand | Red Line |
| Customer Reviews | 4.8 4.8 out of 5 stars (1,683) |
| Date First Available | July 3, 2012 |
| Global Trade Identification Number | 00083522503051 |
| Is Discontinued By Manufacturer | No |
| Item Form | Fluids,Liquid,Oil |
| Item Weight | 4.99 pounds |
| Item model number | 50305 |
| Liquid Volume | 128 Fluid Ounces |
| Manufacturer | Red Line |
| Manufacturer Part Number | 50305 |
| Material | Synthetic |
| Model | 50305 |
| Number of Items | 1 |
| OEM Part Number | 50305 |
| Package Information | Bottle |
| Product Dimensions | 7.5 x 4 x 11.25 inches |
| Recommended Uses For Product | Lube |
| Specific Uses For Product | Manual transmissions and transaxles |
| UPC | 083522503051 |
| Unit Count | 128.0 Fluid Ounces |

## Product Details

- **Brand:** Red Line
- **Item Weight:** 2.27 Kilograms
- **Liquid Volume:** 128 Fluid Ounces
- **Material:** Synthetic
- **Package Information:** Bottle

## Images

![50305 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL) - 1 Gallon - Image 1](https://m.media-amazon.com/images/I/71oe7Mrgl5L.jpg)

## Questions & Answers

**Q: Can you mix gl-4 gear oil with gl-5 gear oil? what is difference? if do 50/50....will be good together? why or why not?**
A: NO NO NO...  GL-4 is specific for older transmissions that have bronze/brass parts. GL-5 will DESTROY these parts.. believe me I know from experience. My local speed shop mistakenly gave me GL-5 for my 91 YJ with the X-5 trans.  Within ten miles I could smell the problem happening. They honored the mistake and gave me a gallon of correct GL-4 so at 150K my X5 was shifting much better. It's in the shop now at 185K for a trans rebuild (yeah it lasted THAT long) and Troy Transmissions was pleased to hear I wanted Redline. He insists on synthetics for Arizona heat and drivers who get in extreme conditions, look up the "back way to Crown King" for an idea of our kind of fun.  And a heads up for the Y owners... beware the fast lube places.  I went to two different shops and BOTH insisted GL-5 was the correct lube!!!  NOT! Luckily the $450 they wanted just to change fluids scared me off and I did what Jeepers should do... work on your own rig yourself.

**Q: why do many say to not change the old gear oil & that the "gunk" in old gear oil makes transmssion last longer & might have problems with new gear oil**
A: What they are referring to is automatic transmission fluid. Automatic transmissions have a series of "bands" with clutch like materials bonded to the friction side. On a worn out automatic transmission, the friction materials on these bands are already smoothed out and slip. Since automatic transmission are driven by hydraulic pressure, the "gunk" suspended inside old fluid will help with "gripping" action with these band. This redline gear oil is used in Manual transmissions. The old saying would not apply here.

**Q: Is MT 90 good for a 1995 jeep yj manual transmission?**
A: Yes, great product; bought the vehicle used and it was not sure what  type of fluid it had in the transmission. The jeep sounded like a bus and once I added the MT-90; big difference and most importantly much quietly.

**Q: Is this product compatible with my 1975 vw beetle, type 1 which spec's 85w/90 gl-4 gear oil? or do you have a synthetic product that is?**
A: I would look on the Volkswagen site or call a Volkswagen service department you can fool around with weights on engine oil but I wouldn't put the wrong weight in on a transmission

## Customer Reviews

### ⭐⭐⭐⭐⭐ 1st gen tacoma gold
*by M***N on January 10, 2017*

2003 Toyota Tacoma 2.7L - 4x4 - 5spd manual Box was well packaged and sealed in a plastic bag (think mine was double layer plastic). By far the best fluid to run in the manual transmission and transfer case. Seriously avoid supertech (walmarts fluid - especially in the differentials). The first time I put this in, I did a flush with walmarts cheap sythentic fluid (75w-90 supertech) for 200miles just to make sure all the metal was out. I would not recommend more than 500 to 2,000 miles on supertech. With supertech synthetic, I accidentally ended up putting 7000 miles on the rear differential which is a higher torque spindle-type differential in most trucks and the temps were incredibly bad. > 180F @ regular 90mph. Really you shouldn't take most spindle type differentials above 75-80mph because of the wear. With amsoil the rear diff dropped down to 120 for the first 15miles and then around 140 at 90mph. - this is with outside temps of 85+. No more steel flaking and rusting. I'd use amsoil in the transfer case and manual transmission but it's not as good as this stuff at the varying temps. + the transmission doesn't get hot like a rear diff with 210,000 miles. And the transfer case barely sees any speed or wear even at the highest mphs. Thank god for brass. Drain bolts are 24mm. I used a tekton 2ft breaker bar and a shallow 24mm socket. Also bought the u-joints for ratchets just in case. Best fluid (lowest temps & smooth) I've found for the differential is amsoil severe gear 75-110 (yes I know the manual calls for 75w-90). Also, 75w-140 has very weird properties. So bigger numbers are not always better. Used valvoline dextron VI for power steering, which is meh after 10k miles. Will change to amsoil. Mobile1 seems best in the engine from a cost and wear perspective. I usually get pennzoil full synthetic because mobile1 is sold out. Pennzoil is nearly as good for the first 3,500 then seems to degrade much faster. Every truck varies. My rear differentials were probably neglected from the previous owner and exceeding the payload rating numerous times or perhaps someone possibly did not try too hard to get the perfect backlash / etc from the factory. These are my recommended milage drain marks: 15,000-25,000 rear diff 30,000+ front diff (will likely look good for you) 25,000 transmission 40,000-60,000 transfer case (unless this takes you years as in acid is more of a factor than viscosity) 30,000 for power steering 7,000 for engine Brake fluid 2 years if you dare :p Save yourself $150-$400, help your car, and buy the good fluid and do the transmission, transfer case, and rear differential yourself. It's easier than an oil change. No filter required. Fill ports offer idiot proof over/under filling assuming you're on level ground. I do it in the walmart parking lot with a 7qt oil container. Some brake cleaner. Scotts shop towels. Gloves (yes plz). Some empty distilled water containers. And a funnel. Might need a partner to hold the empty containers up while you pour the used oil. The front differential requires 10mm and 12mm hex to ratchet attachments and is much more tricky to access. Worth it though. :)

### ⭐⭐⭐⭐⭐ The only manual transmission oil I will ever buy anymore
*by T***Y on July 10, 2021*

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.

### ⭐⭐⭐⭐⭐ For manual transmission GL-4
*by A***. on December 14, 2025*

I had trouble finding a GL-4 manual transmission fluid and I think this is a very good product. However I think it's overpriced, but so are most other things in life. This actually smells like transmission fluid and not gear oil. Time will tell how good of a product it is. I want to give 4 stars because I think it's overpriced, but since it's less expensive than Toyota I'll still give it 5 stars

## Frequently Bought Together

- Red Line 50305 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL) - 1 Gallon
- Slippery Pete Fluid Pump for Gallon Bottles and Wide Mouth Quart Bottles (Not for Standard Quart Bottles) - Transfer Gear Oil, Transmission and Differential Fluid, Antifreeze with This 30cc Hand Pump
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*Product available on Desertcart Cyprus*
*Store origin: CY*
*Last updated: 2026-02-02*