I got this car about 4 years ago with 70k. Almost to 120k now. Its been flawless except for a dead battery at the most inopportune time from leaving lights on. I've done most maintenance other than a brake flush which a mechanic did. According to my records I've just done the 4th drain and fill of the Toyota WS trans fluid since I've had it. Each time probably 3 to 3.5 quarts is replaced. I did this in 2016, 2017, and now about 6 months or 10k miles apart twice in 2019. I have no idea if it was done at all before 70k. The trans shifts very well, especially under low throttle. Sometimes on the highway during passing, if the trans shift from 5 to 3, it will be a bit sluggish going back to 4, then it might hang in 4 for several seconds before shifting back to 5. I just did the last drain and fill a couple days ago, so I'll drive it for a bit to see, but I don't think the fluid is the issue. I left a little space in there with the last fill. Should I give lubegard red a try?