Not sure if it will work. generally the seals fail because of the heat. i dont think any stop leak additive will work thats why MB decided to replace the seal with a better quality that meets the heat torture.

 

I may try a bottle next oil change. Anybody think it would hurt? It's supposed to treat the seals and prevent deterioration.

 

My only experience with was not in the conventional way.

I wiped down the door seals of the old ML with it a couple times to get a better seal. It actually worked. I have a leaking axle seal on a pickup truck and I am tempted to add it to the rear diff.

 

Not a big "snake oil" guy, but the Amazon reviews were so positive I bought some to try out on my sons Audi S4 which is and always has been a consistent leaker... worth a shot : )

 

I added a bottle of this stuff to my 0W-40 and my rear main seal still has a very slow leak. I think my oil is too thin so I'm going to try it again when I have 5W-40 in the engine.

 

I know this is an old thread, but have you guys had good luck with at-205? My 2010 gl450 appears to have the oil cooler leak and I’m wondering if it worked for OP?

 

I think it worked. Remember you have to use almost 2 bottles because of our oil capacities. My indy shop told me my leak was the oil cooler seals and suggested I just live with it. The ATP seemed to stop the leak. Then I had a few drops on the floor. Then it stopped and hasn't leaked for a while. I also had changed to Mobil 1 TDT 5-40. So I believe it helped.