I recently saw a project farm video that was about a high mileage honda accord v6 automatic that had some odd shifting going on. Some shifts were latent and appeared to him as slight slippage. He added the Lucas additive and the video showed overall shifting improvement. What I thought was interesting was the VOA from Blackstone on the Lucas. Basically, the Lucas has just about no additives but a very high viscosity index. So the conclusion was the Lucas makes the fluid thicker. As I suspected, magic transmission rebuild in a bottle is snake oil that raises the viscosity and nothing more.