Red Line 30504 D4 Synthetic Automatic Transmission Fluid (ATF) - 1 Quart

Noticed difference in 1st week smoother shifts, crisp going through the gears

I had a small hitch going into second gear in my 2017 corvette grand sport with the manual seven speed transmission. I changed the transmission fluid and now the hitch is gone . Awesome product , will buy again. Thank you

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.

I used this stuff to do a full flush on my 2003 Mazda Tribute. My car was starting to shutter (maybe slip?) when I was going steady at ~55mph and the engines rpms were low (presumably 4th gear, it's a 4 speed automatic). It wouldn't do this if I stepped on the gas and the car downshifted. After flushing my tranny with this fluid, that shuttering has not happened. Also, my first and 2nd gear shifts are MUCH smoother, sometimes they can only be noticed by watching the tachometer. I have driven about 4k miles since flushing my transmission, and I haven't had any more wonky transmission behavior!!! How I did it/instructions for the Mazda Tribute 2003 (same for Mercury Mariner and Ford Escape ~2002-2006 I'm not 100% sure of those years): I connected the fluid output of the transmission (going to the radiator) to a 3/8" ID fuel hose and put the other end of the hose in a 5 gallon bucket. I poured in 12 quarts in with the car running and in park. When I started the car it gushed out ~4 quarts. As you add more it flushes more out. This is how I have seen it done in many YouTube videos, hopefully it is flushing the old stuff out! I would think it would have to be. Anyway, after adding 12 quarts and letting it empty itself until it couldn't anymore, I turned off the car, reconnected the output of the transmission to the radiator, and topped off the sump area (3-4 more quarts were need). I drove around a bit, came back and checked the level. I used my manual for further instructions on perfecting the transmission fluid level (this is equally important if not more important than having fresh fluid!!!), and one week later I drove 1 hour to my parents' house, parked in their garage (you want a surface that is almost perfectly level. A small grade makes a huge difference in my car!) And with the engine hot, running and in park I checked the fluid. I needed to add a bit more. You want to actually drive at decent speeds before checking your fluid. If you let it idle for a long time it gets hotter than it would be if air is constantly flowing through the radiator! What I did was I turned my car off when I got to my parents house, got ready in about 1 minute to check the level and add fluid if necessary, started the car again (didn't want to run it for that minute for fear that I would further heat the fluid and get a false reading), and then I checked the level, added, checked, and added again until it was 1/3 up the hashed area. The dipstick says not to add more if it's in the hashed area. I wanted it to be at least 1/3 of the way up since I had driven on a cold day. Hope this review helps!!

Super fast shipping and this stuff is great! Best price online too.

It works great but I haven't noticed any difference in shifting quality over the Mobil 1 fluid. I got this primarily because the Mobil 1 fluid suffers from excessive shearing (it thins out with use too quickly), which isn't enough to cause any real issue but it might mean rougher shifting later down the road when other synthetic fluids would still be good. It did improve my shifting a bit, as did my two previous drain and fills, since there was still 2-3 quarts of the old, burnt fluid floating around in my transmission. Also, some people here said it came out dark when they drained it shortly after putting this in, make sure you flushed or did several drain and fills with fresh fluid (even if it's cheap fluid, any new fluid) before putting this in. Even if there's still just 20% of the old, black transmission fluid remaining, it can make the fluid come out very dark. It might improve shifting over products like MaxLife because those products are often made thinner to be compatible with Dexron VI transmissions. This can result in rougher shifting. Try regular Dex/Merc and you will probably not notice much difference between this fluid and the Dex/Merc. Of course this fluid will hold up a lot better with time but it won't magically make your transmission like new again. I'm not buying this again because it's way too expensive on Amazon (over $13 a quart after tax) to justify putting it in my older car, but it's a durable fluid that is actually made for Dexron III transmissions (unlike MaxLife and similar products) and I'm sure it will hold up well with time and withstand abuse.

My 2000 Accord had started slipping at a bit over 100,000 miles, especially in 1st and 2nd gear. It ended up triggering the engine warning light. Took it into the dealership and they said the torque converter was going and that I needed to replace the transmission with a rebuilt to the tune of $4,500. I did some research online and found out that Honda has had many problems with their post year 2000 transmissions in several vehicles, including the Accord. But several people had replaced their transmission fluid with Red Line D4 ATF and also installed an inline Magnefine AFT filter. (Honda's ATF filter is internal to the transmission and is not changeable.) Seeing that many others had good results, I figured the $50-60 for the price of an full ATF change it was worth a try. Immediately after doing a full fluid replacement (and I mean the very first drive) I noticed a dramatic improvement in the shifting. I almost couldn't not feel the car shift at all anymore and could only tell by the engine noise and tach. I don't recall the transmission every shifting that smoothly. I cleared the engine light/warning code, and have been driving fine ever since. That was over 3,000 miles ago. I've since done a D&R on my 2008 Odyssey and also noticed that the sifting is much smoother. So glad to have found out that this was a possible solution and avoided the complete transmission replacement. Saved me over $4,000. I'm planning on a D&R on each vehicle each time I do a standard oil change. 2-3 quarts/change is very cheap insurance against replacing a transmission. I don't review many items, but I'm so pleased with the results of this product, I had to give it kudos.

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.

Très bon produit, j'utilise ce produit exclusivement pour ma Corvette C6 depuis longtemps !

Matches 955 Cayenne transfer case fluid specs.

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

Great for my Hurth gearboxes on my boat.

Works great in my BMW Z3, only need 1 quart.