--- product_id: 3962881 title: "30504 D4 Synthetic Automatic Transmission Fluid (ATF) - 1 Quart" brand: "red line" price: "£22.70" currency: GBP in_stock: true reviews_count: 13 category: "Red Line" url: https://www.desertcart.co.uk/products/3962881-30504-d4-synthetic-automatic-transmission-fluid-atf-1-quart store_origin: GB region: United Kingdom --- # Universal ATF compatibility GL-4 gear protection Cold climate smooth shifting 30504 D4 Synthetic Automatic Transmission Fluid (ATF) - 1 Quart **Brand:** red line **Price:** £22.70 **Availability:** ✅ In Stock ## Summary > ⚡ Shift into the future with Red Line’s synthetic power! ## Quick Answers - **What is this?** 30504 D4 Synthetic Automatic Transmission Fluid (ATF) - 1 Quart by red line - **How much does it cost?** £22.70 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/3962881-30504-d4-synthetic-automatic-transmission-fluid-atf-1-quart) ## 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 Cold-Weather Shifts:** Balanced slipperiness ensures silky smooth gear changes even in freezing temps. - • **One Fluid, Endless Applications:** Compatible with Dexron III, Mercon V, and more—perfect for automatic, manual, and power steering systems. - • **Unmatched Gear & Synchro Defense:** Protects your transmission with GL-4 level precision for longer-lasting performance. - • **Revive & Extend Transmission Life:** Real users report smoother shifts and cooler running temps—don’t let your ride fall behind. - • **Trusted by Performance Enthusiasts:** Since 1979, Red Line has been the go-to for drivers who demand peak transmission health. ## Overview Red Line 30504 D4 Synthetic ATF is a premium, versatile transmission fluid engineered for superior gear protection and smooth shifting across automatic and manual transmissions. Compatible with a wide range of OEM specs including Dexron III and Mercon V, it excels in cold climates and high-performance applications, ensuring cooler operation and extended transmission life. ## Description Product description Review: Smooth Shifting, Even on Cold Starts - Great transmission fluid noticed an immediate difference after the change. My 6-speed shifts are much smoother, especially from 1st to 2nd and 2nd to 3rd. Even on cold starts, when the transmission used to feel a bit notchy, now it shifts like butter. Review: Get it for your Honda - Got Redline D4 for my 04 Honda Accord w Auto trans. Did some extensive reading about product on various forums and what not prior to deciding to give it a shot. I'm a big fan of Hondas, but if you're looking at this stuff for your Honda you already know all about the transmission issues. And you probably already know that most people tell you to only use z1 or the new dw1 fluid from Honda. I had a 2000 accord prior to this one, bought it used and did the trans drain and fill 3 times w dw1- 5k miles later I had trans issues. Maybe the fluid, maybe not. Car had 190k. My 04 has 130k and I just purchased it used. When I initially drove it I didn't notice anything with the transmission, but the more I drove it I started to notice a bit of a long shift from first to second, and a bit of gear searching from time to time in the city. I knew the fluid was a little dirty and my first step when I buy a used car is to change oil, trans fluid, diff fluids, power steering, etc. so that tells you a little about my maintenance habits w vehicles and my attention to detail. I only use Mobil 1 synthetics religiously but their ATF Fluid wasn't necessarily "recommended". So I decided to give this Redline a shot. I must say, I haven't driven many miles yet (500 or so) since the change, so time may change my mind. However, with how auto trans work you can usually tell almost instantly if you have a fluid that isn't compatible with your car. Slipping, weird shifting, etc. I am really pleased with the results of the Redline ATF though. I immediately notice little to no gear searching, and the 1-2 shift is much better. Overall the shifts are still smooth when I'm just taking my time, and very quick and precise if I'm giving a little more gas. Granted my fluid was ready for a change, but I think the Redline improved my cars shifting more than new Honda fluid would have. I've seen both results in different cars. I did a 4 x drain and fill using 12 qts of Redline to get as much old out as I could. My advice, forget Honda fluid and buy this Redline. It's a much better fluid. It's synthetic. It works great, and seems to be completely compatible with Honda's fragile transmissions. In my opinion it's the best precaution you can possibly take. I'm really pleased with the results. As I said before, time could change my opinion but I don't expect it to. Synthetic fluids run cooler, don't break down as easily or as quickly, last longer, etc. I plan to drain 3 quarts and fill at every 5k oil change. Overkill? Maybe. But if you own a Honda and are looking at Redline fluid you know why I'm taking the extra precaution. ## Features - EXCELLENT - gear and synchro protection, balanced slipperiness for easier shifting in cold climates - ALSO USED WITH - manual transmissions and transaxles like T-5, T-45, T-56 and late-model BMW, provides a GL-4 level of gear protection - MOST VERSATILE ATF - use where Dexron III, Dexron II, Mercon and Mercon V fluids are recommended, for use in automatic, manual transmissions and power steering - POPULAR TRANSMISSION FLUID FOR - Toyota Type T-III and T-IV, Honda ATF-Z1, Nissan Matic D, J & K, Diamond SP-II, SP-III, Mazda ATF M-V, most BMW and Audi/VW automatic transmissions - WHY RED LINE - Established in 1979, Red Line Products perform & protect better than any on the market. No compromises ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B000CPI5XM | | Best Sellers Rank | #19,306 in Automotive ( See Top 100 in Automotive ) #73 in Transmission Fluids | | Brand | Red Line | | Brand Name | Red Line | | Container Type | Bottle | | Customer Reviews | 4.8 out of 5 stars 1,324 Reviews | | Global Trade Identification Number | 00083522305044 | | Included Components | Per Item Description | | Item Form | Liquid | | Item Weight | 1.7 Pounds | | Liquid Volume | 0.95 Liters | | Manufacturer | Red Line | | Material | Synthetic | | Model Number | RED30504 | | Number of Items | 1 | | Package Information | Bottle | | Part Interchange Info | 30504 | | Part Number | 30504 | | Recommended Uses For Product | For use in automatic and manual transmissions, power steering, racing transmissions | | Specific Uses For Product | Automatic and Manual Transmissions, Power Steering | | UPC | 083522305044 | | Unit Count | 32.0 Fluid Ounces | ## Product Details - **Brand:** Red Line - **Item Weight:** 1.7 Pounds - **Liquid Volume:** 0.95 Liters - **Material:** Synthetic - **Package Information:** Bottle ## Images ![30504 D4 Synthetic Automatic Transmission Fluid (ATF) - 1 Quart - Image 1](https://m.media-amazon.com/images/I/61ttowW8L7L.jpg) ![30504 D4 Synthetic Automatic Transmission Fluid (ATF) - 1 Quart - Image 2](https://m.media-amazon.com/images/I/816puXlsWhL.jpg) ![30504 D4 Synthetic Automatic Transmission Fluid (ATF) - 1 Quart - Image 3](https://m.media-amazon.com/images/I/81NYvHmamKL.jpg) ![30504 D4 Synthetic Automatic Transmission Fluid (ATF) - 1 Quart - Image 4](https://m.media-amazon.com/images/I/81owXIUH2ML.jpg) ![30504 D4 Synthetic Automatic Transmission Fluid (ATF) - 1 Quart - Image 5](https://m.media-amazon.com/images/I/81FdqU+HxcL.jpg) ## Questions & Answers **Q: Is this d4 atf fluid work on 2002 lexus ls430** A: yes **Q: Is it better to use Lubegard 63010 Platinum Universal ATF Protectant with this ATF?** A: Lubegard additives are safe with all fluids except for CVT Transmissions, and Ford type F. Their products are very good. LG Platinum is designed to meet mfg approval specs for ATF without approval codes on a PROPER base ATF fluid. I just did an Auto trans service on a 2000 Jetta TDi.(supposedly sealed and need no service for life) Yeah right. I changed the Trans filter, and pan gasket, and Side Cover gasket. I refilled with 3.5L Ravenol full synth ATF it's already fully compliant ATF with VW specs and still added LG Platinum just to keep things inside good. (seals, valves moving etc.) Tranny has 287K on it, expect to get at least 150K or more out of it now. **Q: Is this compatable with a Honda Accord 2000 LX Automatic Transmission?** A: That transmission should call for ATF Z1. Red Line recommends for this spec, so you shouldn't have a problem with using D4 in your Accord.Here's a link: http://www.redlineoil.com/product.aspx?pid=51&pcid=9 **Q: Can anyone say if I can use this on a mazda 3 2010 model automatic transmission with a manuel overdrive?** A: I'm using Red Line D4 in my 2011 3S 2.5L since 2011 no issues even in low 15 degree temps. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Smooth Shifting, Even on Cold Starts *by G***S on April 25, 2026* Great transmission fluid noticed an immediate difference after the change. My 6-speed shifts are much smoother, especially from 1st to 2nd and 2nd to 3rd. Even on cold starts, when the transmission used to feel a bit notchy, now it shifts like butter. ### ⭐⭐⭐⭐⭐ Get it for your Honda *by J***Y on January 15, 2014* Got Redline D4 for my 04 Honda Accord w Auto trans. Did some extensive reading about product on various forums and what not prior to deciding to give it a shot. I'm a big fan of Hondas, but if you're looking at this stuff for your Honda you already know all about the transmission issues. And you probably already know that most people tell you to only use z1 or the new dw1 fluid from Honda. I had a 2000 accord prior to this one, bought it used and did the trans drain and fill 3 times w dw1- 5k miles later I had trans issues. Maybe the fluid, maybe not. Car had 190k. My 04 has 130k and I just purchased it used. When I initially drove it I didn't notice anything with the transmission, but the more I drove it I started to notice a bit of a long shift from first to second, and a bit of gear searching from time to time in the city. I knew the fluid was a little dirty and my first step when I buy a used car is to change oil, trans fluid, diff fluids, power steering, etc. so that tells you a little about my maintenance habits w vehicles and my attention to detail. I only use Mobil 1 synthetics religiously but their ATF Fluid wasn't necessarily "recommended". So I decided to give this Redline a shot. I must say, I haven't driven many miles yet (500 or so) since the change, so time may change my mind. However, with how auto trans work you can usually tell almost instantly if you have a fluid that isn't compatible with your car. Slipping, weird shifting, etc. I am really pleased with the results of the Redline ATF though. I immediately notice little to no gear searching, and the 1-2 shift is much better. Overall the shifts are still smooth when I'm just taking my time, and very quick and precise if I'm giving a little more gas. Granted my fluid was ready for a change, but I think the Redline improved my cars shifting more than new Honda fluid would have. I've seen both results in different cars. I did a 4 x drain and fill using 12 qts of Redline to get as much old out as I could. My advice, forget Honda fluid and buy this Redline. It's a much better fluid. It's synthetic. It works great, and seems to be completely compatible with Honda's fragile transmissions. In my opinion it's the best precaution you can possibly take. I'm really pleased with the results. As I said before, time could change my opinion but I don't expect it to. Synthetic fluids run cooler, don't break down as easily or as quickly, last longer, etc. I plan to drain 3 quarts and fill at every 5k oil change. Overkill? Maybe. But if you own a Honda and are looking at Redline fluid you know why I'm taking the extra precaution. ### ⭐⭐⭐⭐⭐ Definitely Do Recommend! *by Z***3 on April 19, 2026* Super fast shipping and this stuff is great! Best price online too. ## Frequently Bought Together - Red Line 30504 D4 Synthetic Automatic Transmission Fluid (ATF) - 1 Quart - Red Line 57904 75W90 GL-5 Synthetic Gear Oil for Hypoid Limited Slip Differentials - 1 Quart - 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.co.uk/products/3962881-30504-d4-synthetic-automatic-transmission-fluid-atf-1-quart](https://www.desertcart.co.uk/products/3962881-30504-d4-synthetic-automatic-transmission-fluid-atf-1-quart) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-06-02*