--- product_id: 2219323 title: "50304 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL)- 1 Quart" brand: "redline oil" price: "B/.82" currency: PAB in_stock: true reviews_count: 13 category: "Red Line" url: https://www.desertcart.com.pa/products/2219323-50304-mt-90-75w-90-gl-4-manual-transmission-transaxle store_origin: PA region: Panama --- # GL-4 rating ensures safe synchro compatibility 75W-90 viscosity for optimal gear protection Eliminates notchy shifting even in cold temps 50304 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL)- 1 Quart **Brand:** redline oil **Price:** B/.82 **Availability:** ✅ In Stock ## Summary > ⚙️ Shift Smooth, Drive Confident: The Ultimate GL-4 Gear Oil Upgrade ## Quick Answers - **What is this?** 50304 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL)- 1 Quart by redline oil - **How much does it cost?** B/.82 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.com.pa](https://www.desertcart.com.pa/products/2219323-50304-mt-90-75w-90-gl-4-manual-transmission-transaxle) ## Best For - redline oil enthusiasts ## Why This Product - Trusted redline oil brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Synchro-Safe Formula:** GL-4 certified to protect delicate brass synchros—no more corrosive damage from harsh sulfurs. - • **Cold-Start Performance:** Engineered to eliminate notchy, grinding shifts even when your car is cold—drive with confidence from the first mile. - • **Precision Gear Protection:** Advanced 75W-90 viscosity guards your transmission for longer synchro life and smoother drives. - • **Trusted Legacy Since 1979:** Red Line’s proven formula outperforms and outlasts, making it the go-to choice for manual transmission enthusiasts. - • **Top-Rated & Highly Reviewed:** Join over 5,000 satisfied drivers who’ve upgraded their shifting experience with a 4.9-star rating. ## Overview Red Line 50304 MT-90 is a premium 75W-90 GL-4 manual transmission lubricant designed to protect brass synchros and ensure smooth, precise shifting. Its high-performance formula eliminates notchy shifts even in cold conditions, extending transmission life. Trusted since 1979 and highly rated by thousands, it’s the essential gear oil for manual transmission vehicles requiring GL-4 specification. ## Description Buy Red Line 50304 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL)- 1 Quart: Gear Oils - desertcart.com ✓ FREE DELIVERY possible on eligible purchases Review: Scion grinding in 2nd or 3rd? This is what you need! - Wow, I am shocked! So I've been dealing with my gears grinding in 2nd and 3rd for the past 1 1/2 Years in my manual 2005 Scion XA the car has had the problem since before i bought it, The previous owners replaced the clutch, And I'm assuming that someone had added extra gear oil, Because it spilled out when i took off the fill cap on ramps, I've been trying to figure out the grinding, For the past 2 years doing everything but trying to put a new clutch in, Previous owners also stated that the mechanic may have put the clutch in wrong, I guess he didn't, Because this nearly completely fixed the issue in under 200 miles of driving, Driving has also become much smoother, If you have a Scion XA i suggest changing to this oil regardless if your gears are grinding! You only need exactly 2 quarts for the Scion XA no more no less, I wish all m mechanics would look this up before adding too much oil! I found this out from reading forms on the Scion XA, Everyone suggested this oil for the grinding and regardless! So i hope someone sees it here! Review: GL-4 gear oil specific for manual transmissions - This is an excellent product for cars with manual transmissions requiring GL-4 rated gear oil, specifically for 75W-90 weight. Putting gear oil that is GL-5 or dual rated GL-4 / GL-5 can potentially cause damage to the soft metal components inside your transmission. The high sulfer content in those gear oils can eat away the synchros inside your transmission, making shifting more difficult. This gear oil is safe, and specifically designed for use in manual transmissions. It won't eat away any of the components, and it leaves your car shifting smooth. I mistakenly put a dual rated gear oil in my wife's manual transmission. I thougt I would be safe using a GL-4 / GL-5 rated oil. I left it in there for about a year before discovering my mistake. The transmission didn't shift very well, and it was making grinding noises while driving. I eventually drained the fluid and replaced with this. Upon draining the oil, there was a lot of gold colored flecks that came out with the oil. That was material from the transmission synchros. I replaced with MT-90. The shifting improved greatly, but the transmission had already been damaged too severly. I ended up having to replace the transmission. I drained the gear oil at the time of the transmission swap. There were no gold flecks with the MT-90. The damage had all taken place prior to using the redline MT-90 gear oil. The new transmission was filled with MT-90 as well, and it has not had any issues. Pros: -one of the few available GL-4 gear oils on the market -Designed specifically for manual transmissions -reasonably priced Cons: -None (for the oil itself) -not avaialbe for sale off the shelf at most retailers (not a con of the product itself at all, especially if you are looking to buy through desertcart) Like I said above, if your car's manual transmission requires GL-4 rated 75W-90 gear oil, then this oil will meet your needs and be safe for your transmission. ## 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 | B000CPCBEQ | | Best Sellers Rank | #1,585 in Automotive ( See Top 100 in Automotive ) #4 in Gear Oils | | Brand | Redline Oil | | Brand Name | Redline Oil | | Compatible Material | Brass | | Container Type | Bottle | | Customer Reviews | 4.9 out of 5 stars 5,098 Reviews | | Global Trade Identification Number | 00083522503044 | | Included Components | MT-90 75W-90 GL-4 | | Item Form | Fluids,Oil | | Item Type Name | ACCESSORIES | | Item Weight | 1.7 pounds | | Liquid Volume | 32 fluid ounces | | Manufacturer | Yukon Gear & Axle | | Material | Brass | | Model Number | 50304 | | Number of Items | 1 | | Number of Packs | 1 | | Package Information | Bottle | | Part Number | 50304 | | Recommended Uses For Product | Lubricant,Lube | | SAE J300 Viscosity Grade | 75W-90 | | UPC | 083522503044 | | Unit Count | 32 Fluid Ounces | | Viscosity | 75W90 | | Warranty Description | LIMITED WARRANTY | ## Product Details - **Brand:** Redline Oil - **Item Weight:** 1.7 pounds - **Liquid Volume:** 32 fluid ounces - **Material:** Brass - **Package Information:** Bottle ## Images ![50304 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL)- 1 Quart - Image 1](https://m.media-amazon.com/images/I/61iZ6pnD7aL.jpg) ## Available Options This product comes in different **Size, Number Of Items** options. ## Questions & Answers **Q: Is anyone running this in an NV4500 long term? How does it hold up?** A: I've been running it for 35,000 miles in my 1996 model GM NV4500 without issue. **Q: Do I pour the entire contents directly in? Are there any special instructions?** A: To get maximum benefit of the Red Line you need to replace all the oil in the transmission. For my car, it took 3.4 quarts so I bought four and filled it up until fluid was level with the bottom of the fill plug. If you go to the Red Line website, they have which transmission oil is correct for your car and the capacity of the transmission so you will know how much you will need. **Q: Is this product non-synthetic gl-3?** A: Synthetic gl -4 oil **Q: Can i use on 1992 chevy camaro rs?** A: I would not. It is supposed to be OEM recommended for my 98 vw Cabrio 5speed. So Put $46 worth in and at0°F I could not shift the car until 30 minutes of idling. second Synchromesh was very fussy at 20deg ## Customer Reviews ### ⭐⭐⭐⭐⭐ Scion grinding in 2nd or 3rd? This is what you need! *by A***N on June 26, 2026* Wow, I am shocked! So I've been dealing with my gears grinding in 2nd and 3rd for the past 1 1/2 Years in my manual 2005 Scion XA the car has had the problem since before i bought it, The previous owners replaced the clutch, And I'm assuming that someone had added extra gear oil, Because it spilled out when i took off the fill cap on ramps, I've been trying to figure out the grinding, For the past 2 years doing everything but trying to put a new clutch in, Previous owners also stated that the mechanic may have put the clutch in wrong, I guess he didn't, Because this nearly completely fixed the issue in under 200 miles of driving, Driving has also become much smoother, If you have a Scion XA i suggest changing to this oil regardless if your gears are grinding! You only need exactly 2 quarts for the Scion XA no more no less, I wish all m mechanics would look this up before adding too much oil! I found this out from reading forms on the Scion XA, Everyone suggested this oil for the grinding and regardless! So i hope someone sees it here! ### ⭐⭐⭐⭐⭐ GL-4 gear oil specific for manual transmissions *by M***Y on August 15, 2012* This is an excellent product for cars with manual transmissions requiring GL-4 rated gear oil, specifically for 75W-90 weight. Putting gear oil that is GL-5 or dual rated GL-4 / GL-5 can potentially cause damage to the soft metal components inside your transmission. The high sulfer content in those gear oils can eat away the synchros inside your transmission, making shifting more difficult. This gear oil is safe, and specifically designed for use in manual transmissions. It won't eat away any of the components, and it leaves your car shifting smooth. I mistakenly put a dual rated gear oil in my wife's manual transmission. I thougt I would be safe using a GL-4 / GL-5 rated oil. I left it in there for about a year before discovering my mistake. The transmission didn't shift very well, and it was making grinding noises while driving. I eventually drained the fluid and replaced with this. Upon draining the oil, there was a lot of gold colored flecks that came out with the oil. That was material from the transmission synchros. I replaced with MT-90. The shifting improved greatly, but the transmission had already been damaged too severly. I ended up having to replace the transmission. I drained the gear oil at the time of the transmission swap. There were no gold flecks with the MT-90. The damage had all taken place prior to using the redline MT-90 gear oil. The new transmission was filled with MT-90 as well, and it has not had any issues. Pros: -one of the few available GL-4 gear oils on the market -Designed specifically for manual transmissions -reasonably priced Cons: -None (for the oil itself) -not avaialbe for sale off the shelf at most retailers (not a con of the product itself at all, especially if you are looking to buy through amazon) Like I said above, if your car's manual transmission requires GL-4 rated 75W-90 gear oil, then this oil will meet your needs and be safe for your transmission. ### ⭐⭐⭐⭐⭐ Seems to be a very good oem alternate *by K***B on July 14, 2026* My 2007 Corolla 5 speed always had a “notchy” first gear engagement when coming to a stop and this was immediately gone when switching to this fluid. Keep in mind when i drained my transmission the old fluid smelled like it was at the end of its life and i have no idea which fluid was in it before as I’ve only put about 15k miles on the car in over a year and a half. Overall I’m very happy with this fluid and it seemed to make shifting overall more smooth. Would recommend ## Frequently Bought Together - Red Line 50304 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL)- 1 Quart - Red Line 57904 75W90 GL-5 Synthetic Gear Oil for Hypoid Limited Slip Differentials - 1 Quart - Slippery Pete - Fluid Pump for Standard Quart Bottles - 8cc per Pump Stroke and 3rd Hand Adapter, Transfer Gear Oil, Transmission and Differential Fluid (28mm) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.com.pa/products/2219323-50304-mt-90-75w-90-gl-4-manual-transmission-transaxle](https://www.desertcart.com.pa/products/2219323-50304-mt-90-75w-90-gl-4-manual-transmission-transaxle) --- *Product available on Desertcart Panama* *Store origin: PA* *Last updated: 2026-09-21*