--- product_id: 269584796 title: "50305 MT-90 75W90 GL-4 Gear Oil - 1 Gallon" brand: "red line" price: "1605.49 DT" currency: TND in_stock: true reviews_count: 5 url: https://www.desertcart.tn/products/269584796-50305-mt-90-75w90-gl-4-gear-oil-1-gallon store_origin: TN region: Tunisia --- # Optimized for manual transmissions & transaxles 75W90 GL-4 viscosity grade Smooth shifting even in cold temps 50305 MT-90 75W90 GL-4 Gear Oil - 1 Gallon **Brand:** red line **Price:** 1605.49 DT **Availability:** ✅ In Stock ## Summary > ⚙️ Shift smarter, not harder — dominate every drive! ## Quick Answers - **What is this?** 50305 MT-90 75W90 GL-4 Gear Oil - 1 Gallon by red line - **How much does it cost?** 1605.49 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/269584796-50305-mt-90-75w90-gl-4-gear-oil-1-gallon) ## 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 - • **Cold-Start Performance:** Ensures smooth shifting even when temperatures drop - • **High-Temp Gear Defense:** Prevents gear whine and rattle under extreme heat - • **Universal Compatibility:** Meets GL-1, GL-3, and GL-4 specs for versatile use - • **Precision Friction Balance:** Perfect coefficient of friction for synchronizer protection - • **Effortless Shifting, Every Time:** Eliminates notchy shifting for seamless gear changes ## Overview Red Line 50305 MT-90 is a premium 75W90 GL-4 gear oil engineered for manual transmissions and transaxles. It delivers superior gear and synchronizer protection, eliminates notchy shifting, and maintains smooth performance even in cold conditions. Trusted by enthusiasts and professionals alike, it prevents gear noise at high temperatures and meets multiple gear oil standards for broad compatibility. ## Description Red Line MT-90 Manual Transmission Lubricant A 75W90 GL-4 gear oil (SAE 10W/15W/40 engine oil viscosity) designed for use in manual transmissions and transaxles. Red Line MT-90 Manual Transmission Lubricant provides excellent protection of gears and synchronizers and its balanced slipperiness provides a perfect coefficient of friction, allowing easier shifting. Red Line MTL / MT-90 BENEFIT SUMMARY Eliminates notchy shifting Designed for manual transmissions and transaxles Perfect synchronizer coefficient of friction Enables high-speed downshifting Excellent shifting even when cold Eliminates gear whine and rattle at high temperatures High-performance gear protection Non-corrosive toward synchronizers Satisfies manual transmissions and transaxles requiring motor oils or GL-1, GL-3, or GL-4 gear oils. ## Features - manufacturer: Generic - Item Trademark: GENERIC - Item Weight: pounds, pounds, 7.00, 7.00 - Item Category: Machine Lubricant ## Technical Specifications | Specification | Value | |---------------|-------| | Asin | B002INX20C | | Best Sellers Rank | #113,359 in Automotive (See Top 100 in Automotive) #999 in Automotive Oils | | Brand Name | Red Line | | Container Type | Drum | | Customer Reviews | 4.8 4.8 out of 5 stars (1,585) 4.8 out of 5 stars | | Global Trade Identification Number | 00083522503051 | | Item Form | Oil | | Item Weight | 2.27 Kilograms | | Liquid Volume | 128 Fluid Ounces | | Manufacturer | Red Line | | Material | PU | | Model Number | 50305 | | Number Of Items | 1 | | Number Of Packs | 1 | | Part Number | 50305 | | Recommended Uses For Product | Lube | | Sae J300 Viscosity Grade | 75W-90 | | Specific Uses For Product | Manual transmissions and transaxles | | Unit Count | 128 Fluid Ounces | | Upc | 083522503051 | | Viscosity | 75W90 GL-4 | ## Product Details - **Brand:** Red Line - **Item weight:** 2.27 Kilograms - **Liquid volume:** 128 Fluid Ounces - **Material:** PU - **Package information:** Drum ## Images ![50305 MT-90 75W90 GL-4 Gear Oil - 1 Gallon - Image 1](https://m.media-amazon.com/images/I/71oe7Mrgl5L.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 ## Customer Reviews ### ⭐⭐⭐⭐⭐ This Gear Oil Literally Changed My Life *by on Reviewed in Canada 26 January 2020* Well not really, but it brought my transmission back to life on the very first drive after putting it in. I can now get back into first and have almost completely cured my crunch getting into second. All other gears are just fantastic.Is it because my transmissions gear oil just hasn't been changed in too long, or is it because this product actually is magic? I'm not sure to be honest, but I will for sure be buying the same thing again next time.Bought for 1998 Jeep TJ and have a small amount left over which is also excellent. ### ⭐⭐⭐⭐⭐ Parfait *by on Reviewed in France 16 May 2024* Reçu dans les temps et très bien emballé ### ⭐⭐⭐⭐⭐ Ottimo prodotto! *by on Reviewed in Italy 5 August 2026* Il cambio è nettamente migliorato! ## 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/269584796-50305-mt-90-75w90-gl-4-gear-oil-1-gallon](https://www.desertcart.tn/products/269584796-50305-mt-90-75w90-gl-4-gear-oil-1-gallon) --- *Product available on Desertcart Tunisia* *Store origin: TN* *Last updated: 2026-09-28*