Normally I would agree with you...I don't subscribe to the magic fix in a bottle trick and I don't put those snake oils in either,.... this particular product I got at the dealership and it was'nt from the typical snake oil people...I have not seen this product anywhere else. If the Nissan dealership mechanics use it, I think this might be more credible than snake oil. It is worth a try if the o-rings are the culprit. If it does'nt work the trans needs to come completely apart anyways, right? Now that IS expensive.