I have 99 TL with 150K miles. Dealer pointed out slow leak from PS pump seals, said PS pump needed to be replaced. I could see the fluid discoloration on the engine components below the pump. I monitored loss of PS fluid and it emptied the resivoir in about 3-4 months so I learned to top it off as needed. Then I found Gunk PS fluid and leak stop (for Honda's) and figured I'd try. I used turkey baster to suck out old fluid and replaced with fresh. Old fluid was dark and murky. I did this three or four times over period of 6 months. I never did actually drain because I didn't know how to. Now, there is no fluid loss at all after 4 months. I am very pleased.

Paul

 

Probably just something in it to cause seals to swell, like old trick of adding a bit of brake fluid.