--- product_id: 7824058 title: "Red Line 50305 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL) - 1 Gallon" brand: "red line" price: "872.57 DT" currency: TND in_stock: true category: "Red Line" url: https://www.desertcart.tn/products/7824058-red-line-50305-mt-90-75w-90-gl-4-manual store_origin: TN region: Tunisia --- # Friction formula for smoother, quicker shifts 75W-90 viscosity for optimal gear protection GL-4 safe for brass synchros, no corrosive sulfurs Red Line 50305 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL) - 1 Gallon **Brand:** red line **Price:** 872.57 DT **Availability:** ✅ In Stock ## Summary > ⚙️ Shift into the fast lane with Red Line’s smoothest gear oil yet! ## Quick Answers - **What is this?** Red Line 50305 MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant (MTL) - 1 Gallon by red line - **How much does it cost?** 872.57 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/7824058-red-line-50305-mt-90-75w-90-gl-4-manual) ## 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 - • **Brass-Safe Formula:** Protects delicate synchros by avoiding harmful reactive sulfurs found in GL-5 oils - • **Unmatched Gear Defense:** Extends synchro life with high-performance synthetic formula - • **Versatile Compatibility:** Perfect for GL-1, GL-3, and GL-4 manual transmissions and transaxles - • **Trusted Legacy Performance:** Red Line’s industry-leading lubricant since 1979, proven by 5,000+ rave reviews - • **Seamless Shifting Experience:** Eliminates notchy shifts even in cold starts for instant precision ## Overview Red Line 50305 MT-90 is a premium synthetic 75W-90 GL-4 manual transmission and transaxle lubricant designed to protect gears and extend synchro life. Its unique friction formula ensures quicker, smoother shifts even in cold conditions, while its brass-safe composition prevents damage common with GL-5 oils. Trusted since 1979 and highly rated by thousands, this 1-gallon bottle is the go-to choice for professional-grade manual transmission care. ## 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 ## 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 | #1,516 in Automotive ( See Top 100 in Automotive ) #3 in Gear Oils | | Brand | Red Line | | Brand Name | Red Line | | Compatible Material | Brass | | Container Type | Bottle | | Customer Reviews | 4.9 out of 5 stars 5,096 Reviews | | Global Trade Identification Number | 00083522503051 | | Included Components | MT-90 75W-90 GL-4 | | Item Form | Fluids,Liquid,Oil | | Item Weight | 2.27 kg | | Liquid Volume | 128 fluid ounces | | Manufacturer | Red Line | | Material | Synthetic | | Model Number | 50305 | | Number of Items | 1 | | Number of Packs | 1 | | Package Information | Bottle | | Part Interchange Info | 50305 | | Part Number | 50305 | | Recommended Uses For Product | Lube | | SAE J300 Viscosity Grade | 75W-90 | | Specific Uses For Product | Manual transmissions and transaxles | | UPC | 083522503051 | | Unit Count | 128 Fluid Ounces | ## Product Details - **Brand:** Red Line - **Item Weight:** 2.27 kg - **Liquid Volume:** 128 fluid ounces - **Material:** Synthetic - **Package Information:** Bottle ## Images ![Red Line 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) ## Available Options This product comes in different **Size, Number Of Items** options. ## 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.tn/products/7824058-red-line-50305-mt-90-75w-90-gl-4-manual](https://www.desertcart.tn/products/7824058-red-line-50305-mt-90-75w-90-gl-4-manual) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-10-01*