I have an '02 with a small leak at the PS pump shaft seal. I understand that leaks at the pump shaft are a bit harder to stop. Before I pull the pump and have it rebuilt, I was curious if anyone has had any luck with Stop Leak products for leaks at the pump. I've done a little reading that suggests the STP Fluid+Stop Leak is a little better than others.

 

I would give it a try. Mine was leaking badly or I would have tried it. Good luck!

 

I have never had any luck with any stop leak products. It would most likely be a temporary fix even if it worked. With that said I know someone who claims to have good luck with an engine oil stop leak so i guess you got nothing to lose to try. IMHO Get it fixed right and never worry about it again

 

I wouldn't use any of that type of product unless I really didn't care about the machine. As you might be aware, the products swell the seal via the chemical composition of the fluid, and while that might be a passible idea for an already failed seal , all of your other seals are also going to swell in the same way. I would think this would diminish the service life of all the other intact seals.

While not as demanding as an automatic transmission, the difference in the amount of seal swelling is what separates the various transmission fluids. Most know the wrong fluid will destroy a transmission, so I am transferring that insight to the less demanding question of sealing your power steering shaft.

I am not really at the skill level to be giving out advice, but most people are skeptical of any mechanic in a can solution , save for some radiator cleaning products, it's not just me. I am also aware of a leaking steering rack being a common area of concern in these cars. As amateur of fact, my steering rack is a little damp, and will need to be repaired when the seals get worse. Swelling the seals might get me down the road, but I would guess it would also increase wear.

All of this is without any actual experience with chemically enlarged seals. But I have other experience with other types of mechanical sealing, and it all depends on a balance between too little clearance, which means too much friction, and not enough drag, which creates a leak. It's a delicate clearance, and I wouldn't throw chemicals at a failed seal and just hope for the best, unless it was the only seal effected, and already shot, with nothing to loose.

I would hope somebody with actual experience will contribute that it worked long term for them. But, as expressed in my opinions, I wouldn't bet on that.
Good luck with your outcome.