It depends on why it's leaking and what type seal it is.
Often a leaking rear main is a symptom of a more serious problem, as in loose main bearings. Add to that worn rings causing the crankcase to pressurize, and push oil out the rear seal or anywhere else it can get out.
It can also be caused by improper installation, especially if it is a rope seal. They are very prone to leak if proper and detailed procedures are not used on installation.
Oil stop leak products work by softening and swelling age hardened rubber seals. That is the extent of their ability.
If it is a rope seal, don't expect any benefit. If it is a new rubber seal that is leaking because of improper installation, or oil is coming under the rear main cap, or the pan gasket, no, it will not help.
But one thing I have found that does help, in most cases, and it must be done with caution, is to run the oil level a quart low. And double check that the dip stick is correct, if it's wrong, or the tube is not fully seated, running too much oil can cause one to leak.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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