--- product_id: 269584796 title: "50305 MT-90 75W90 GL-4 Gear Oil - 1 Gallon" brand: "red line" price: "$364.72" currency: USD in_stock: true reviews_count: 5 category: "Red Line" url: https://www.desertcart.us/products/269584796-50305-mt-90-75w90-gl-4-gear-oil-1-gallon store_origin: US region: United States of America --- # Reduces shifting time by up to 40% 75W90 GL-4 viscosity for optimal gear protection Smooth shifting even in cold temperatures 50305 MT-90 75W90 GL-4 Gear Oil - 1 Gallon **Brand:** red line **Price:** $364.72 **Availability:** ✅ In Stock ## Summary > ⚙️ Shift smarter, not harder — unlock seamless gear mastery! ## Quick Answers - **What is this?** 50305 MT-90 75W90 GL-4 Gear Oil - 1 Gallon by red line - **How much does it cost?** $364.72 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/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 - • **Effortless Shifting:** Balanced slipperiness ensures a perfect coefficient of friction for silky smooth gear changes. - • **Noise Reduction Tech:** Eliminates gear whine and rattle at high temps for a quieter, premium driving experience. - • **Cold-Start Performance:** Maintains excellent shifting response even at low temperatures—no more stiff gearboxes. - • **Universal Compatibility:** Meets or exceeds GL-1, GL-3, and GL-4 specs—ideal for manual transmissions and transaxles. - • **Precision Gear Protection:** Advanced 75W90 GL-4 formula guards gears and synchronizers against wear and corrosion. ## Overview Red Line 50305 MT-90 is a high-performance 75W90 GL-4 gear oil designed specifically for manual transmissions and transaxles. It delivers superior gear and synchronizer protection, reduces shifting effort and noise, and performs reliably even in cold conditions. Trusted by over 1,500 users with a 4.8-star rating, this 1-gallon lubricant is your go-to for enhanced transmission longevity and smoother drives. ## 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. Review: Ottimo prodotto - Ottimo prodotto Review: Performance oil - Gear shifting in Audi 01E dropped from 0,5 to 0,3 seconds ## 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 | #103,934 in Automotive ( See Top 100 in Automotive ) #957 in Automotive Oils | | Brand | Red Line | | Brand Name | Red Line | | Container Type | Drum | | Customer Reviews | 4.8 out of 5 stars 1,569 Reviews | | Global Trade Identification Number | 00083522503051 | | Item Form | Oil | | Item Weight | 2.27 Kilograms | | Item weight | 2.27 Kilograms | | Liquid Volume | 128 Fluid Ounces | | Liquid volume | 128 Fluid Ounces | | Manufacturer | Red Line | | Material | PU | | Model Number | 50305 | | Number of Items | 1 | | Package information | Drum | | Part Number | 50305 | | Recommended Uses For Product | Lube | | 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 | | 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 ### ⭐⭐⭐⭐⭐ Ottimo prodotto *by M***. on 29 August 2024* Ottimo prodotto ### ⭐⭐⭐⭐⭐ Performance oil *by R***S on 15 May 2025* Gear shifting in Audi 01E dropped from 0,5 to 0,3 seconds ### ⭐⭐⭐⭐⭐ Excellent *by M***0 on 28 October 2025* Excellent fluid recommended by others. ## 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.us/products/269584796-50305-mt-90-75w90-gl-4-gear-oil-1-gallon](https://www.desertcart.us/products/269584796-50305-mt-90-75w90-gl-4-gear-oil-1-gallon) --- *Product available on Desertcart United States of America* *Store origin: US* *Last updated: 2026-08-06*