--- product_id: 724925715 title: "Red Line MT-90 Gear Oil 75W90 GL-4 1 Gallon (128 Ounces) 50305" brand: "red line" price: "12064018₫" currency: VND in_stock: true category: "Red Line" url: https://www.desertcart.vn/products/724925715-red-line-mt-90-gear-oil-75w90-gl-4-1 store_origin: VN region: Vietnam --- # Faster, notch-free gear changes 75W90 viscosity for optimal gear protection Cold-weather smooth shifting Red Line MT-90 Gear Oil 75W90 GL-4 1 Gallon (128 Ounces) 50305 **Brand:** red line **Price:** 12064018₫ **Availability:** ✅ In Stock ## Summary > ⚙️ Shift smoother, drive smarter — never settle for crunchy gears again! ## Quick Answers - **What is this?** Red Line MT-90 Gear Oil 75W90 GL-4 1 Gallon (128 Ounces) 50305 by red line - **How much does it cost?** 12064018₫ with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.vn](https://www.desertcart.vn/products/724925715-red-line-mt-90-gear-oil-75w90-gl-4-1) ## 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 - • **Effortless Shifting:** Balanced glide enables faster, smoother downshifts and crisp gear engagement every time. - • **Safe on Brass Syncs:** Non-corrosive, sulfur-free formula protects delicate synchronizers unlike typical GL-5 oils. - • **Cold-Weather Champion:** Engineered friction coefficient eliminates notch shifting even in freezing temps for seamless drives. - • **Precision Gear Protection:** Advanced synthetic formula guards gears and synchronizers for longer transmission life. - • **Trusted Performance Legacy:** Since 1979, Red Line delivers uncompromising quality favored by automotive pros and enthusiasts alike. ## Overview Red Line MT-90 75W90 GL-4 Gear Oil is a premium synthetic lubricant designed for manual transmissions and transaxles. It offers superior gear and synchronizer protection, eliminates notch shifting in cold weather, and ensures faster, smoother gear changes. Safe for brass synchronizers and compatible with GL-1, GL-3, and GL-4 applications, this 1-gallon formula is trusted by professionals since 1979 for unmatched performance and durability. ## Description Red Line MT-90 Manual Transmission Lubricant A 75W90 GL-4 Gear Oil (SAE 10W/15W/40 Engine Oil Viscosity) is designed for manual transmissions and transaxles. Red Line MT-90 Manual Transmission Lubricant provides superior gear and synchronizer protection, balanced glide provides the perfect coefficient of friction to facilitate shifting. Red Line MTL / MT-90 Benefits Overview * Eliminates notch shift * Designed for manual transmission and transaxle * Perfect synchronizer friction coefficient * Allows fast downshifting * Excellent shifting in cold conditions * Eliminates gear ringing and rattling at high temperatures * High performance gear protection * Non-corrosive against synchronizer * Meets manual transmission and transaxle requecles Motor Oil or GL-1, GL-3, GL-4 gear oil ## Features - High Performance - Gear protection and longer sync life Recommended for GL-1, GL-3, and GL-4 applications - QUICK SHIFT - Perfect synchronizer friction coefficient prevents notch shifting in cold weather - REQUIREMENTS - Gear Oil Viscosity 75W, 80W, SAE 40 10W40, 15W40 Motor Oil - Popular Gear Oil - GL-1, GL-3, GL-4 applications and most special synchromesh fluids designated. Safe for brass syncs because it lacks reactive sulfur which can cause damage in most GL-5 oils - WHY CHOOSE RED LINE - Founded in 1979, Red Line Products offers superior performance and protection than any other product on the market. No compromise ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B002INX20C | | Amazon Bestseller | #545,220 in Automotive ( See Top 100 in Automotive ) #556 in Gear Oils | | Brand Name | Red Line | | Container Type | Can | | Customer Reviews | 4.8 4.8 out of 5 stars (1,559) | | Global Trade Identification Number | 00083522503051 | | Item Weight | 2.27 Kilograms | | Liquid Volume | 128 Fluid Ounces | | Manufacturer | Red Line | | Material | Synthetic | | Model Number | 50305 | | Number of Items | 1 | | Part Number | 50305 | | Recommended Uses For Product | Lubricant | | Specific Uses For Product | Manual transmission and transaxle | | UPC | 083522503051 | | Unit Count | 3785.41 Milliliters | ## Product Details - **Brand:** Red Line - **Item Weight:** 2.27 Kilograms - **Liquid Volume:** 128 Fluid Ounces - **Material:** Synthetic - **Package Information:** Can ## Images ![Red Line MT-90 Gear Oil 75W90 GL-4 1 Gallon (128 Ounces) 50305 - Image 1](https://m.media-amazon.com/images/I/71oe7Mrgl5L.jpg) ![Red Line MT-90 Gear Oil 75W90 GL-4 1 Gallon (128 Ounces) 50305 - Image 2](https://m.media-amazon.com/images/I/71eg2LTltAL.jpg) ![Red Line MT-90 Gear Oil 75W90 GL-4 1 Gallon (128 Ounces) 50305 - Image 3](https://m.media-amazon.com/images/I/81eZ7tyT1BL.jpg) ![Red Line MT-90 Gear Oil 75W90 GL-4 1 Gallon (128 Ounces) 50305 - Image 4](https://m.media-amazon.com/images/I/81hzhcHUXLL.jpg) ![Red Line MT-90 Gear Oil 75W90 GL-4 1 Gallon (128 Ounces) 50305 - Image 5](https://m.media-amazon.com/images/I/81M9Tv+BFuL.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 ## 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 - Red Line 57905 75W90 GL-5 Synthetic Gear Oil for Hypoid Limited Slip Differentials - 1 Gallon --- ## 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.vn/products/724925715-red-line-mt-90-gear-oil-75w90-gl-4-1](https://www.desertcart.vn/products/724925715-red-line-mt-90-gear-oil-75w90-gl-4-1) --- *Product available on Desertcart Vietnam* *Store origin: VN* *Last updated: 2026-05-18*