ACDelco GM Original Equipment 10-4014 Friction Modified Synchromesh Transmission Fluid, 32 Ounce, White, 1 qt

I have owned two third generation Acura TLs with 6 speed manual transmissions at this point. I bought one at 129k miles and the other at 84k miles, with the higher mileage TL being a 2005 base and the lower mileage one being a 2008 Type-S. The 2005 had issues going into third gear pretty often (i.e. every few shifts). It would feel almost like it went in, but then would pop out as soon as you released the clutch; I was not skip shifting and have never had a similar issue in any other vehicle over hundreds of thousands of miles of driving other manual transmissions, including mostly Subarus, Isuzus, and BMWs as well as motorcycle and dirtbike transmissions. The 2008 had the same issue, but only once every few dozen shifts and it could be avoided completely by preloading 3rd gear a bit and shifting really slowly. On both vehicles, I changed the transmission fluid to OEM honda fluid and drove for about 500 miles and didn't notice any improvement. I then changed both vehicles over to this stuff and they both felt better right away and felt even better after 100-200 miles. Neither has had any issue whatsoever going into third after the fluid change to this stuff. I have about 12k miles on the 2005 base with no degradation or return of the issue, but only a few hundred miles on the 2008 Type-S. I'll report back if there is any long-term harm in using this fluid on the 3G TL platform, but for now I'm enjoying the improvement in shift quality.

If you own a 90s Honda this is a must. I experienced significantly better shifting immediately after I replaced the transmission oil. It gets better the more you drive it.

2000 VW Jetta TDI GLS 02J Trans 157,000 miles (pretty sure factory fill or maybe one change during previous ownership) Excellent fluid that is actually thicker than VW's version of 75W-90. G070 (VW newest revision of MTF) has a cSt of about 6.4 with this stuff at around 9.0. Honda and Acura owners swear by this stuff with a majority of TDICLUB members agreeing on how good it is. The price on Amazon is unbeatable for me. $27/quart at the GM Dealership? No thank you. I actually ran the G070 for a little while and had nothing but issues in traffic. I live in Hawaii and the gearbox would get awfully hot when sitting in traffic. When it was getting hot I was getting shifting issues, 1st gear was almost locked out during a 3 hour stint of traffic! Once I refilled with this stuff I was blown away. The G070 was good when the trans was cold and mediocre when warmed up, but this stuff… I took a quick test drive and was shocked, it shifted like butter when cold. I didn’t think it was going to get any better as the G070 did okay when cold. Once the trans was warmed up, all issues were resolved. No more lock outs, no more grinding and no notchy shifts. I have put about 600 miles on this stuff and it is fantastic. I plan on changing every year or two as I do with all manual trans cars so we will see how it does in the long run but for now I can slam gears with no grinding at all. Not that I slam gears a lot but it is kind of a test to see how well it is working with the synchronizers. One last note, There is a guy on the TDICLUB that swears by this stuff and has over 350,000 miles worth of transmission wear on synchromesh, he had no ill effects running it and never had carrier bearing issues or excessive gear lash as some people would think due to not running a 75W-90 GL4 Gear oil. I assure you though, VW doesn’t use anything close to 75W-90 with their gear oil (thinner than the Pennzoil as well) and the transmissions still last a very long time using VW’s thin fluid. Conclusion, must buy for me. If you are on the fence about trying it, do some research and see if anyone has run it before on your particular make and model. What works for me may not work for you or your vehicle. Good luck!

Worked awesome on my 08 accord v6 6 speed had third gear pop out and first gear little hesitation going in fixed it instantly couple months later not one pop out super smooth engagement 100% recommend

Coming up on my 2nd fluid change on my 2013 Civic 5-speed manual, I did some reading on a few Honda chats and forums and some were recommending this American (!) fluid for my Japanese car! I had no major issues with the Honda MTF other than occasional stiffness when shifting into reverse. Basically, I was just curious. I love to experiment with things like this. This is thicker than the Honda fluid, so it does reduce gear whine. Shifting is a little smoother and much easier going into reverse. It's been only about a week now, but I will update if I encounter any problems. So far, so good!

2008 TL Type S 6MT I read the AZ reviews and was a little skeptical about this MTF. A lot of people use it to make the gearbox shift more smoothly and to help reduce the 3rd gear issue with a rougher shift. Doing the trans fluid swap on this car is very easy to do. Once the new fluid was in place and everything was buttoned up, I spent some time going through the gears before I turned the vehicle over. Then I went for a drive and tried to put on a few miles before handing the vehicle back over to the wife. I told her I changed transmission fluid (30k miles was up) but nothing else. I wanted an objective opinion on whether or not things improved in the gearbox. After the first day she drove it, she hunted me down and talked to me for about 5 minutes on how much smoother and better the car shifts. She said third gear is like every other gear now and thank you for doing it. So, we need to get a few more miles on the car but you can already tell something has changed for the better. Like she said, she never thought a MTF change would improve the gearbox this much. So synchromesh it is from here on out for the TLS gearbox.