--- product_id: 7601045 title: "50304 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL) - 1 Quart (4 Pack)" brand: "red line oil" price: "755.21 DT" currency: TND in_stock: true reviews_count: 13 category: "Red Line" url: https://www.desertcart.tn/products/7601045-50304-mt-90-75w-90-gl-4-manual-transmission-transaxle store_origin: TN region: Tunisia --- # Synthetic formula withstands high heat & load GL-4 rating safe for brass synchros & smooth shifts 75W-90 viscosity for optimal gear protection 50304 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL) - 1 Quart (4 Pack) **Brand:** red line oil **Price:** 755.21 DT **Availability:** ✅ In Stock ## Summary > ⚙️ Shift smarter, not harder — unlock the smoothest drive of your life! ## Quick Answers - **What is this?** 50304 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL) - 1 Quart (4 Pack) by red line oil - **How much does it cost?** 755.21 DT with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.tn](https://www.desertcart.tn/products/7601045-50304-mt-90-75w-90-gl-4-manual-transmission-transaxle) ## Best For - red line oil enthusiasts ## Why This Product - Trusted red line oil brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Synchro Savior:** Protect your transmission’s brass synchros with a GL-4 formula free of harmful reactive sulfurs. - • **Heat & Load Resilience:** Synthetic 75W-90 oil engineered to maintain performance under extreme driving conditions. - • **Precision Shift Mastery:** Experience buttery smooth, notchy-free gear changes even in cold starts. - • **Universal Compatibility:** Ideal for manual transmissions and transaxles in Nissan, Toyota, Mazda, and more. - • **Trusted Legacy Performance:** Since 1979, Red Line delivers uncompromising gear protection and extended synchro life. ## Overview Red Line 50304 MT-90 is a premium synthetic 75W-90 GL-4 manual transmission and transaxle lubricant designed to enhance gear protection, extend synchro life, and deliver smoother, quieter shifts. Its unique formula is safe for brass synchros, eliminates notchy shifting even in cold conditions, and withstands high heat and load, making it the go-to choice for performance-minded drivers seeking reliable, long-lasting transmission care. ## Description Buy Red Line 50304 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL) - 1 Quart (4 Pack): Gear Oils - desertcart.com ✓ FREE DELIVERY possible on eligible purchases Review: Smooth Shifting and Quiet Operation—Worth the Upgrade - Red Line MT-90 is a top-tier synthetic gear oil that delivers noticeable improvements in manual transmission performance. I used it in a high-mileage 5-speed and immediately felt smoother shifts—especially in cold weather. It quieted down some minor gear whine and made engagement feel more precise. The GL-4 rating is perfect for transmissions that need protection without the aggressive additives found in GL-5 oils, which can be harsh on yellow metals like synchros. The viscosity is ideal for most import and domestic gearboxes that spec 75W-90, and it holds up well under heat and load. If you're chasing better shift feel or just want to treat your transmission right, MT-90 is a solid investment. It’s not the cheapest option, but the performance and protection are worth every drop. Review: Favorite choice for GL-4. Worth the extra cost. - Noticeably better shifts. Synchro engagement feels much smoother. ## 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 | B003P550IE | | Best Sellers Rank | #13,713 in Automotive ( See Top 100 in Automotive ) #31 in Gear Oils | | Brand Name | Red Line Oil | | Container Type | Bottle | | Customer Reviews | 4.8 4.8 out of 5 stars (409) | | Item Form | Fluids,Oil | | Liquid Volume | 128 Fluid Ounces | | Manufacturer | Red Line | | Material | Synthetic | | Recommended Uses For Product | Gear Oil | | Specific Uses For Product | Manual transmissions and transaxles, particularly in vehicles from Nissan, Toyota, and Mazda, and in conditions that require gear protection, smooth shifting, and longer synchro life. | | UPC | 737534816608 | | Unit Count | 128.0 Fluid Ounces | | Viscosity | 75W90 | ## Product Details - **Brand:** Red Line Oil - **Liquid Volume:** 128 Fluid Ounces - **Material:** Synthetic - **Package Information:** Bottle - **Recommended Uses For Product:** Gear Oil ## Images ![50304 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL) - 1 Quart (4 Pack) - Image 1](https://m.media-amazon.com/images/I/71LJIn7PldL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Smooth Shifting and Quiet Operation—Worth the Upgrade *by F***E on October 14, 2025* Red Line MT-90 is a top-tier synthetic gear oil that delivers noticeable improvements in manual transmission performance. I used it in a high-mileage 5-speed and immediately felt smoother shifts—especially in cold weather. It quieted down some minor gear whine and made engagement feel more precise. The GL-4 rating is perfect for transmissions that need protection without the aggressive additives found in GL-5 oils, which can be harsh on yellow metals like synchros. The viscosity is ideal for most import and domestic gearboxes that spec 75W-90, and it holds up well under heat and load. If you're chasing better shift feel or just want to treat your transmission right, MT-90 is a solid investment. It’s not the cheapest option, but the performance and protection are worth every drop. ### ⭐⭐⭐⭐⭐ Favorite choice for GL-4. Worth the extra cost. *by C***O on March 26, 2026* Noticeably better shifts. Synchro engagement feels much smoother. ### ⭐⭐⭐⭐⭐ Excellent synthetic manual transmission gear oil *by R***C on January 22, 2026* Excellent manual transmission gear oil We notice easier the Toyota Tacoma is much easier to shift gears in cold weather. Previous brand oil required much slower shifting with considerable resistance on cold morning below 40 degrees. GL4 is much safer to use in transmission with brass parts than GL5 because GL5 additives are often chemically reactive with brass causing unnecessary wear. ## Frequently Bought Together - Red Line 50304 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL) - 1 Quart (4 Pack) - Slippery Pete - Fluid Pump for Standard Quart Bottles - 8cc per Pump Stroke and 3rd Hand Adapter, Transfer Gear Oil, Transmission and Differential Fluid (28mm) - Red Line 57904 75W90 GL-5 Synthetic Gear Oil for Hypoid Limited Slip Differentials - 1 Quart (4 Pack) --- ## 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.tn/products/7601045-50304-mt-90-75w-90-gl-4-manual-transmission-transaxle](https://www.desertcart.tn/products/7601045-50304-mt-90-75w-90-gl-4-manual-transmission-transaxle) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-05-27*