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⚡ Shift smarter, not harder — the synthetic edge your transmission deserves!
Red Line Synthetic D4 ATF is a premium transmission fluid engineered for both automatic and manual transmissions. It delivers superior low-temperature shiftability and exceptional high-temperature stability, preventing varnish and clutch wear. Compatible with Dexron III, Mercon, and GL-4 specs, it ensures smooth, consistent shifting and extended drain intervals, making it the go-to choice for professionals and enthusiasts seeking reliable, high-performance transmission care.






| ASIN | B000CPI5XM |
| Best Sellers Rank | #39,916 in Automotive ( See Top 100 in Automotive ) #59 in Automotive Transmission Fluids |
| Brand | Red Line |
| Brand Name | Red Line |
| Container Type | Bottle |
| Country of Origin | USA |
| Customer Reviews | 4.8 out of 5 stars 1,052 Reviews |
| Global Trade Identification Number | 00083522305044 |
| Item Form | Oil |
| Item Weight | 1.7 Pounds |
| Item weight | 1.7 Pounds |
| Liquid Volume | 0.95 Liters |
| Liquid volume | 0.95 Liters |
| Manufacturer | Red Line Oil |
| Material | Synthetic |
| Model Number | RED30504 |
| Number of Items | 1 |
| Number of Packs | 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 |
| Recommended uses for product | For use in automatic and manual transmissions, power steering, racing transmissions |
| SAE J300 Viscosity Grade | 5W |
| Specific Uses For Product | Automatic and Manual Transmissions, Power Steering |
| UPC | 083522305044 |
| Unit Count | 1 Count |
| Viscosity | 5w |
N**1
Shifts much smoother.
I used this on my 14 Camaro SS with the M6 TR6060. It used to feel super notchy between shifts when cold and now it feels much smoother. This made a big difference and I definitely will be using it from now on.
G**Y
Good
Matches 955 Cayenne transfer case fluid specs.
A**W
Super
Ich bin begeistert was der getriebeöl redline d4 atf leistet. Die Schalt Vorgänge sind deutlich weicher und sanfter geworden demnächst werden ich komplette öl Wechsel vornehmen. Tolle Arbeit an die amerikanische öl Industrie
A**S
Great Transmission Fluid For My Daily Driver
Works well with my 1998 Toyota Corolla VE which requires Dexron II or III. This covers both since it is a Dexron IV Transmission Fluid. I notice my car so far is less jerky when shifting into reverse.
J**Y
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.
Trustpilot
3 weeks ago
2 months ago