--- product_id: 6635153 title: "Red Line 50504 MT-85 Manual Transmission 75W85 GL-4 Gear Oil - 1 Quart" brand: "red line" price: "42321CFA" currency: XOF in_stock: true reviews_count: 13 url: https://www.desertcart.sn/products/6635153-red-line-50504-mt-85-manual-transmission-75w85-gl-4 store_origin: SN region: Senegal --- # GL-4 spec for synchro safety Cold climate smooth shifting Longer gear & synchro life Red Line 50504 MT-85 Manual Transmission 75W85 GL-4 Gear Oil - 1 Quart **Brand:** red line **Price:** 42321CFA **Availability:** ✅ In Stock ## Summary > ⚙️ Shift smarter, protect stronger — don’t let your ride settle for less! ## Quick Answers - **What is this?** Red Line 50504 MT-85 Manual Transmission 75W85 GL-4 Gear Oil - 1 Quart by red line - **How much does it cost?** 42321CFA with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.sn](https://www.desertcart.sn/products/6635153-red-line-50504-mt-85-manual-transmission-75w85-gl-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 - • **Brass Synchro Safe:** Free from reactive sulfurs found in GL-5 oils, protecting your brass synchros from corrosion and damage. - • **Legacy of Excellence:** Red Line’s 40+ years of innovation guarantees unmatched performance and protection—no compromises. - • **Effortless Cold Shifts:** Balanced friction control ensures silky smooth gear changes even in freezing temperatures—no more grinding or hesitation. - • **Precision Synchro Protection:** Formulated specifically for GL-1, GL-3, and GL-4 applications to extend synchro lifespan and prevent wear. - • **Trusted by Performance Enthusiasts:** The go-to gear oil for Nissan 350Z/370Z, Mitsubishi Evolution, Hyundai, Kia, and Quaife manual transmissions. ## Overview Red Line 50504 MT-85 75W85 GL-4 Gear Oil is a premium polyol ester-based manual transmission fluid designed to deliver superior gear and synchro protection. Ideal for GL-1, GL-3, and GL-4 applications, it ensures quicker, smoother shifts even in cold climates while safeguarding brass synchros from damage. Trusted by enthusiasts for vehicles like Nissan 350Z/370Z and Mitsubishi Evolution, this 1-quart bottle offers proven performance backed by Red Line’s decades-long reputation. ## Description ["https://m.media-desertcart.com/images/S/aplus-media-library-service-media/d657d4dc-27e5-47db-85f0-391cebe7d878.__CR0,0,4393,1800_PT0_SX1464_V1___.png", "https://m.media-desertcart.com/images/S/aplus-media-library-service-media/5d0969ca-1e3b-4319-b7d7-5edab79f39e5.__CR0,0,4393,1800_PT0_SX1464_V1___.png", "https://m.media-desertcart.com/images/S/aplus-media-library-service-media/753eb4da-a15b-4b49-8034-69a7f484e51e.__CR0,0,4393,1800_PT0_SX1464_V1___.png", "https://m.media-desertcart.com/images/S/aplus-media-library-service-media/b7a53ddf-03b4-4cdf-bb67-d27ca3703c2e.__CR0,0,4393,1800_PT0_SX1464_V1___.png", "https://m.media-desertcart.com/images/S/aplus-media-library-service-media/6fbe78b8-153f-4099-9ace-4f36d500dbb3.__CR0,0,4393,1800_PT0_SX1464_V1___.png", 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HIGH PERFORMANCE - Gear protection and longer synchro life. Recommended for GL-1, GL-3, and GL-4 applications, as well as where most special synchromesh fluids are specified - OFFERS QUICKER SHIFTS - Excellent gear and synchro protection, balanced friction control & slipperiness for easier shifting even in cold climates - SAFE FOR BRASS SYNCHROS - GL-4 Gear Oil lacks the reactive sulfurs found in most GL-5 oils that cause damage. Recommended for GL-1, GL-3 & GL-4 applications - POPULAR GEA OIL FOR - Nissan 350Z and 370Z (also most Maxima, Altima & Sentra), Mitsubishi Evolution, Hyundai, Kia and Quaife synchro manual trans applications - WHY RED LINE - Established in 1979, Red Line Products perform & protect better than any on the market. No compromises ## Technical Specifications | Specification | Value | |---------------|-------| | Asin | B004D4URV6 | | Best Sellers Rank | #16,498 in Automotive (See Top 100 in Automotive) #305 in Motor Oils | | Brand Name | Red Line | | Container Type | Bottle | | Customer Reviews | 4.8 4.8 out of 5 stars (889) 4.8 out of 5 stars | | Global Trade Identification Number | 00083522505048 | | Included Components | (1063027) MT-85 75W85 GL-4 GEAR OIL - QUART | | Item Form | Fluids,Oil | | Item Type Name | ENGINE OIL | | Item Weight | 2 Pounds | | Liquid Volume | 32 Fluid Ounces | | Manufacturer | Red Line | | Material | Polyol Ester | | Model Number | RED50504 | | Number Of Items | 1 | | Part Number | 50504 | | Recommended Uses For Product | Vehicle | | Specific Uses For Product | Differential oil, final drive oil, gear oil, transfer case fluid, Nissan 350Z and 370Z, Mitsubishi Evolution, Hyundai, Kia, Quaife synchro manual trans applications | | Unit Count | 32.0 Fluid Ounces | | Upc | 083522505048 | | Viscosity | 5w-30 | | Warranty Description | LIMITED WARRANTY | ## Product Details - **Brand:** Red Line - **Liquid Volume:** 32 Fluid Ounces - **Material:** Mineral Oil, Synthetic Oil - **Package Information:** Bottle - **Recommended Uses For Product:** Vehicle ## Images ![Red Line 50504 MT-85 Manual Transmission 75W85 GL-4 Gear Oil - 1 Quart - Image 1](https://m.media-amazon.com/images/I/71eCG2BDySL.jpg) ![Red Line 50504 MT-85 Manual Transmission 75W85 GL-4 Gear Oil - 1 Quart - Image 2](https://m.media-amazon.com/images/I/81RV3PCsZtL.jpg) ![Red Line 50504 MT-85 Manual Transmission 75W85 GL-4 Gear Oil - 1 Quart - Image 3](https://m.media-amazon.com/images/I/81owXIUH2ML.jpg) ![Red Line 50504 MT-85 Manual Transmission 75W85 GL-4 Gear Oil - 1 Quart - Image 4](https://m.media-amazon.com/images/I/815gxEfuaCL.jpg) ![Red Line 50504 MT-85 Manual Transmission 75W85 GL-4 Gear Oil - 1 Quart - Image 5](https://m.media-amazon.com/images/I/81HDGfZdajL.jpg) ## Available Options This product comes in different **Size** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Fantastic product, Probably the best transmission fluid on the market *by on Reviewed in the United States March 3, 2026* This stuff is fantastic, I'm never going with another transmission fluid ever again. My car shifts SO much smoother now both while cold and warmed up. It's so much less notchy. I drive a genesis coupe, and they have a tendency to grind 1st to 2nd or even 2nd to 3rd if you're driving "spiritedly". It happened to me several times and it was always such a horrible, cringe inducing feeling where I felt so bad to my poor car. After using this fluid I have yet to ever have this problem. Granted I've also upgraded the trans mount to polyurethane, and upgraded the shifter to a chassis mounted short shifter assembly. But still, this fluid is just the cherry on top. It shifts like a freaking dream now. Well worth the extra money. Grinding gears will eventually lead to a destroyed transmission, if this fluid keeps that problem from happening then I say an extra 30 bucks for a transmission fluid change over other brands is WELL worth it. It's such a joy to row through the gears now. ### ⭐⭐⭐⭐⭐ 80% improvement on my Z. Would recommend *by on Reviewed in the United States March 2, 2026* Worked for me noticed 80% improvement in shifting and no transmission noise. ### ⭐⭐⭐⭐⭐ awesome improvment *by on Reviewed in the United States January 29, 2017* I put this in a 2010 Nissan Altima Coupe - 6 speed manual. I live in Colorado, so you can imagine at times temperatures here are less than tropical. Over time my car really didn't like cold weather, in terms of going into gear, most noticeable when down shifting when it was below 0. At times I would have to fight a bit to get the gear I wanted, as the syncros would dislike the idea of the gear selection I made when it was brutally cold.So I decided to give this a try. I drained the MT-85 in my car - replaced it with this - the entire process took under 20 mins. Very quick, very easy to do. Call it easier than an oil change in most ways. I put in this fluid, after about 5 miles of driving I found myself grinning as my car moved through gears like it never had before. Even brand new my car never shifted as well, as smooth. This fluid honestly made my car - with a lot of miles on it now - drive better than it ever has, including when I drove it off the lot with the dealer plates on it.I can't say enough about how such a simple - easy - low cost - thing improved the drivability of my car. Everyone should put this in their manual gear boxes *get the right weight for your car* - just great. Mad I waited so long to do it.----- ------ ----- for those interest in how to do this on an Altima - it is very easy as I said ------ ------ -----Pull out your air intake - like you would to change your air filter - except remove the whole box, there is one Philips screw holding in the air box with the mass air flow sensor in it - it is located right next to your strut mount on the drivers side. Leave the mass air flow sensor hooked up and everything, you just need to move it out of the way a bit.Look down into your engine bay - about 4 inches to the left of your master cyclender you will see a 10 mm bolt holding down the fill hole for your MT fluid. Remove this 10 mm bolt - then just pull the fill hole cover off. Done with opening it, up top - a few mins.Now jack up the car, leave the tires on - see easier than an oil change - locate the drain plug right below the fill hole. this is a 10 mm Hex bolt. put a pan under it, remove the bolt, let the fluid drain. Put the bolt back in, remove the pan with the old fluid, lower the car. In total this takes just a few mins.Now . . . I just put a plain old funnel in the MT fluid fill hole. there is enough room you don't need to use a tube. Open the first bottle of fluid, put your thumb over the opening so you can put its opening into the funnel without spilling it. Remove your thumb from the bottle and let it go into the funnel, into your car.Open the second bottle - measure out 700 ml - pour that 700 Ml into the empty bottle you just put into your car. Now simply put your thumb over the bottle opening, so you can get it into the funnel without spilling, let it drain into your car.Replace the fill cap and bolt - put your air intake back in place - I changed my air filter while I was int here - and your done. Nothing to it. very easy. ## Frequently Bought Together - Red Line 50504 MT-85 Manual Transmission 75W85 GL-4 Gear Oil - 1 Quart - Red Line 50504 MT-85 Manual Transmission 75W85 GL-4 Gear Oil - 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) --- ## 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.sn/products/6635153-red-line-50504-mt-85-manual-transmission-75w85-gl-4](https://www.desertcart.sn/products/6635153-red-line-50504-mt-85-manual-transmission-75w85-gl-4) --- *Product available on Desertcart Senegal* *Store origin: SN* *Last updated: 2026-06-18*