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⚙️ Shift smarter, drive smoother — the synthetic ATF that keeps you ahead of the pack!
Red Line 30504 D4 Synthetic ATF delivers exceptional low-temperature shiftability and high thermal stability, providing GL-4 level gear protection. Compatible with a wide range of automatic and manual transmissions, including popular OEM fluids like Dexron III and Mercon V, it ensures smooth, consistent shifts and extended transmission life. Trusted since 1979, this synthetic fluid is the go-to choice for professionals and enthusiasts seeking reliable, versatile performance.






| ASIN | B000CPI5XM |
| Best Sellers Rank | #31,250 in Automotive ( See Top 100 in Automotive ) #43 in Automotive Transmission Fluids |
| Brand Name | Red Line |
| Container Type | Bottle |
| Customer Reviews | 4.8 4.8 out of 5 stars (1,035) |
| Global Trade Identification Number | 00083522305044 |
| Item Form | Oil |
| Item Weight | 1.7 Pounds |
| Liquid Volume | 0.95 Liters |
| Manufacturer | Red Line |
| Material | Synthetic |
| 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 | 1 Count |
| Viscosity | 5w |
L**A
What can I say? I have nothing but praise for this stuff. I bought my 2004 Acura TL in August and really haven't been able to enjoy it since then because a week after my purchase, I was told by a small shop that my transmission was on its way out. I've been babying the car since then, and keeping my fingers crossed during the several 250 mile trips I've made to my hometown. I didn't have many symptoms, except the occasional chatter, RPM fluctuation, etc. I narrowed it down to the torque converter, then did some research. After replacing the 3rd and 4th gear pressure switches and noticing a little difference, I decided to do more research. Then I heard about this stuff... Oh man, was it ever worth the $130 investment! I first got the car jacked up, and loosened the drain. I'm not kidding, I don't think my fluid has been changed in the 107,000 miles on the car. It was pretty dark, and although there was no "sludge," I wasn't happy with the consistency of the old fluid. I spent a couple hours doing the 3x3 fluid change. First of all, it's a comforting feeling knowing I've got clean, fresh, red fluid in there. Secondly, HOLY CRAP! The car drives like it's brand new! No more "gear guessing" or chatter or anything! Shifts are smooth, clean, crisp, etc. I didn't realize how sloppy the shifts had become until I replaced the fluid with this stuff. If you're even contemplating trying this stuff out, DO IT! Thank you, Red Line, for allowing me to begin enjoying my dream car!!!
L**P
Très bon produit, j'utilise ce produit exclusivement pour ma Corvette C6 depuis longtemps !
G**Y
Matches 955 Cayenne transfer case fluid specs.
A**W
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
F**L
Great for my Hurth gearboxes on my boat.
Trustpilot
2 days ago
1 week ago