I hate it, but a "me too" added to the hat.
I have had great success with Valvoline High Milage synthetic stoppering up leaks. But it would only slow and not stop them completely if it's an egregious loss of seal material.
Only a creepy-crawl up under a vehicle would find and fix the leak. IMO and experience?
Mechanical intervention was the only way to stop up the leaks. Oil cooler hoses, assemblies, valve cover gaskets and filter cooler bypasses are very easy to fix.
If it is weeping from main rear or front gaskets, it's tougher but still repairable in a DIY environment.
But, BIG but here; if you're not mechanically blessed, drag the beast in to the local, trusted shop.
Stop leaks and high mileage treatments cannot rebuild missing seal and gasket material that's deteriorated over the years. If locating and fixing the leak is outside of your skills, the shop will definitely get it right so we're not collectively drinking Mobil-1 in another decade. ;>
