--- product_id: 422174199 title: "Red Line MT-90 Gear Oil- 1 Quart, Pack of 4" brand: "red line" price: "¥50837" currency: JPY in_stock: true category: "Red Line" url: https://www.desertcart.jp/products/422174199-red-line-mt-90-gear-oil-1-quart-pack-4 store_origin: JP region: Japan --- # High shear & oxidation stability under heat GL-4 rating for safe synchro engagement 75W-90 viscosity for optimal gear protection Red Line MT-90 Gear Oil- 1 Quart, Pack of 4 **Brand:** red line **Price:** ¥50837 **Availability:** ✅ In Stock ## Summary > ⚙️ Shift smoother, drive smarter — never settle for less than Red Line MT-90! ## Quick Answers - **What is this?** Red Line MT-90 Gear Oil- 1 Quart, Pack of 4 by red line - **How much does it cost?** ¥50837 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/422174199-red-line-mt-90-gear-oil-1-quart-pack-4) ## 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 - • **Thermal Stability:** Synthetic base oils maintain consistent viscosity across temperature swings for reliable performance. - • **Precision Shiftability:** Engineered to eliminate hard shifting and deliver silky smooth gear changes. - • **Trusted by Enthusiasts:** Highly rated by users for quiet operation and improved shift feel in both domestic and import vehicles. - • **Long-Lasting Protection:** Exceptional shear and oxidation resistance means your transmission stays guarded mile after mile. - • **Synchro-Friendly Formula:** Perfect coefficient of friction protects manual transmission synchronizers without wear. ## Overview Red Line MT-90 Gear Oil is a premium synthetic 75W-90 lubricant designed specifically for manual transmissions and transaxles. Its GL-4 rating and optimized friction coefficient ensure smooth, precise shifting while protecting synchronizers from wear. With outstanding shear and oxidation stability, it maintains consistent viscosity under varying temperatures and heavy loads, making it a top choice for performance and longevity in both domestic and import gearboxes. ## Description Red Line Oil MT-90 is designed to provide excellent protection and improved shiftability for manual transmissions and transaxles having cured the problem of hard shifting in thousands of transmissions with shifting troubles They have the appropriate coefficient of friction for most manual transmission synchronizers many gear oils engine oils and ATFs are too slippery for proper synchro engagement The synthetic base oils used have a very high viscosity index which provides relatively constant viscosity as temperature changes MT-90 is a thicker 75W90 version of MTL The shear stability and oxidation stability of these products are excellent thus the physical characteristics of Red Line MT-90 will change little with use ## Features - Item Category: Machine Lubricant - Item Trademark: Red Line Oil - manufacturer: Generic ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B003P550IE | | Brand Name | Red Line | | Container Type | Bottle | | Customer Reviews | 4.8 4.8 out of 5 stars (404) | | Item Form | Oil | | Liquid Volume | 128 Fluid Ounces | | Manufacturer | Red Line | | Material | Synthetic | | Model Number | 50304 | | Part Number | 50304 | | Recommended Uses For Product | Gear Oil | | UPC | 737534816608 | | Unit Count | 128.0 Fluid Ounces | ## Product Details - **Brand:** Red Line - **Liquid volume:** 128 Fluid Ounces - **Material:** Synthetic - **Package information:** Bottle - **Recommended uses for product:** Gear Oil ## Images ![Red Line MT-90 Gear Oil- 1 Quart, Pack of 4 - Image 1](https://m.media-amazon.com/images/I/71LJIn7PldL.jpg) ![Red Line MT-90 Gear Oil- 1 Quart, Pack of 4 - Image 2](https://m.media-amazon.com/images/I/81zyln3z-IL.jpg) ![Red Line MT-90 Gear Oil- 1 Quart, Pack of 4 - Image 3](https://m.media-amazon.com/images/I/81eZ7tyT1BL.jpg) ![Red Line MT-90 Gear Oil- 1 Quart, Pack of 4 - Image 4](https://m.media-amazon.com/images/I/81hzhcHUXLL.jpg) ![Red Line MT-90 Gear Oil- 1 Quart, Pack of 4 - Image 5](https://m.media-amazon.com/images/I/81M9Tv+BFuL.jpg) ## 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.jp/products/422174199-red-line-mt-90-gear-oil-1-quart-pack-4](https://www.desertcart.jp/products/422174199-red-line-mt-90-gear-oil-1-quart-pack-4) --- *Product available on Desertcart Japan* *Store origin: JP* *Last updated: 2026-05-20*