Red Line 50205 SAE 75W80 API GL-4 Manual Transmission and Transaxle Lubricant (MTL) Car Gear Oil - 1 Gallon

Really like this 75w80 GL-4 MTF from Redline. Works better in my Honda/Acura than Torco MTF. The Torco fluid is really good stuff (I think better) but I picked up a vibration out of 2nd gear, perhaps it was just too slick for the differential or other MT components. This Redline 75w80 GL-4 MTF is of a lower viscosity than the Torco and seems pretty comparable (only in viscosity) to the Honda HG MTF which sounded horrible in my car and wasn't very smooth. My service manual originally recommended 10w-30 motor oil for the MT but then Honda came out with the MTF HG stuff which I tried and immediately switched it out. This Redline is really good stuff and is in the high quality category of Torco, Motul, Mobile One, Amsoil. It's really good, but generally there are certain lubricants that will work better in your car or motorcycle than others. You just have to try them out and unfortunately that can get pretty expensive, since this gallon option was basically $15.60 a quart. Do the research and limit your selections. Since the manual recommends 30k transmission oil changes, this long interval would justify the higher price per quart.

This Red Line manual transmission fluid makes your transmission shift smooth as butter.

I have used this in both of my late model Mini Coopers. Shifts smoother than standard fluid and my transmissions seem happy running it!

Excellent manual trans oil which solved my problems in my 2000 f250 zf5. I had synchro issues/grinding into 2nd and 3rd gear. After filling with this oil, I have zero grinding. Hopefully its still flowing well enough into the bearings, but for now, I'll take it as a win.

Nice product, good value

I traipsed around the Internet for a bit looking for a solid transmission fluid. I had used Redline in the past but it had been a couple of decades. At 50k miles I decided a change was in order and this MTL fluid shifts quick and quietly. I have no noises from the gearbox that I had before.

(PLEASE NOTE: old oil shown in photo is the old genuine Mazda fluid! It is NOT used Redline oil.) I used it in my 2010 Mazdaspeed3 with around 75,000 original miles. I changed it myself, shops in the area didn't want to bother with it. The original trans oil had never been changed (quite simply because, Mazda claims the original factory fluid is a "lifetime" fluid, which it is obviously NOT), and came out of the car looking dark as cocacola, and thick as (real) maple syrup. Whereas this new liquid is transparent, with the slightest hint of red, and flows quite a bit easier than the old, nasty black fluid. Before I changed it, I was having serious issues getting stuck shifting into 1st and 2nd (the shifter often wouldn't want to move all the way into gear). It was so bad that I was considering getting rid of the car. But this new oil fixed it 100%. With the old oil I also had an issue with 2nd gear going in with a crunch (worn synchro probably?), this oil didn't completely eliminate that crunch but it reduced it a lot, and now it goes away completely when the car is fully warmed up. I still can't believe Mazda doesn't have a service interval for changing the transmission fluid in the speed3. This fluid absolutely needs to be changed. As for how to change it in the Mazdaspeed3: https://www.youtube.com/watch?v=yWMk_Q1pE8c Tip: If you can manage to find a funnel long enough, or extend the one you have, then you won't need to remove the airbox. I extended mine with a plastic water hose.

On some Geo Tracker forums it was recomended that a GL4 gear oil be used in the transmission because of yellow metal parts. Before the change it was difficult to go from first to second gear when cold. I drained the old fluid out and replaced with Ford F type transmisson fluid and Marvel Mystery oil. I ran that combination for 1000 miles to clean out the transmission and transfer case. I drained that out and replaced with the Red Line oil. After doing this my transmission shifts more smoothly. I noticed a 2 MPG increase in fuel milage. The transmission is still noisy but that's probably due to the fluid level being low from the previous owner and the 138,000 miles on the vehicle.

Just what I wanted and needed . Thank you

Used in my Jeep Wrangler 1998 Renegade. Transmission is like new no more grinding!

Replaced my 2000 Jeep TJ transmission oil with redline, noticeable improvement as it seems to shift smoother. Glad I purchased this oil based on others recommendations.

Made shifting easier. Original fluid in mini’s ARE NOT LIFETIME!!!! Change it and use this stuff.

It got good on-line reviews. Hard to tell how well it is working unless the transmission blows up.