Red Line 30504

Where I buy Red Line 30504 D4 Automatic Transmission Fluid - 1 Quart Red Line Auto Trans Fluid for Mazda5 Improved PerformanceBy MINImeatI bought Red Line D4 Automatic Transmission Fluid because I accidently drained the fluid from the transmission and double-filled the crankcase while I was changing my own oil. I've never done that during the 100's of oil changes I've done in my life, but the white smoke pouring out of the exhaust and the lack of shifting made it very obvious very quickly.Anyway, I ordered the Red Line after sticking normal auto trans fluid in from my local auto parts store. The normal fluid worked OK, but the shifts weren't very smooth and it was clear from the owner's manual the correct fluid was required.I did some online research and found that Mazda3 owners were pleased with the upgrade to Red Line D4 fluid so, since the Mazda5 has the same engine/trans, I decided to give it a try.First, be careful and don't drain the auto trans fluid unnecessarily because it costs more than oil and a full trans fluid change involves 8 quarts.The Red Line fluid has impressed me with the smoothness of the shifts and the refined feel it brings to the transmission in general. I usually shift manually since my other car is a six-speed MINI and the manual shifts are positive yet smooth for the most part. I think the only negatives I'm left with are the inherent characteristics of the Mazda 5-speed automatic. The 1-2 shift can take some time and the 3-4 shift is sometimes excessively hard under strong acceleration.Overall, I'm pleased with the Red Line D4 Automatic Transmission and confident it was the right product to use for my vehicle.0 of people found the following review helpful. » More Information about Red Line 30504 D4 Automatic Transmission Fluid - 1 Quart.

» Check Price