So, my 2010 had the typical Honda 3rd gear difficulties. It would grind every once in a while, and didn't positively engage 100% a few other times. I decided to go with the Friction Modified GM/AC Delco fluid since Honda fans have stood by it for years (even though the use of GM parts is sacrilege haha)

The trans dumped about 2.3Q and I put about 2.5Q in and let it drip out of the check bolt (if anyone needs help locating this, let me know). Probably settled on ~2.4Q total.

What I've noticed after about 20miles of driving (other than the fluid change is a PITA), 3rd gear does indeed feel better, smooth and light with no sign of difficulty...but 2nd feels a little notch-ier, though it's really tough to compare. The transmission likes a firm handshake in the first place.

Share your experience here.