Oil Seal Repair Additive on 2004 Subaru Forester

I have been told the rear & front oil seals need replaced in my 2004 Forester. I found some oil additive that says it can repair those leaks. Does this work and will it have any adverse impact on the Subaru Forester?

Asked by for the 2004 Subaru Forester
very temporary even if it works. you are much better off considering the repair.

Thanks so much for your reply!