Not uncommon for them to leak a little. A leaking rear seal can leave a big mess and have minimal effect on the engine oil consumption.
Be sure the engine oil is not overfull, as in overfilled or contaminated with gas.
It can also be the front transmission seal.
I have greatly slowed rear main seals by running the oil below the full mark. As long as you know the oil consumption history, running it low will not hurt it.
A leaking rear seal is often a symptom of more serious problems like loose main bearings and excess blow-by. A restricted crankcase breather will also increase crankcase pressure. Only replacing the seal may be a temporary fix or no improvement at all if the engine is getting tired.
If you do go in to repair it, while there it would be a good time to replace the front transmission seal. If it has a dual clutch it will have 2 seals.
Also look up top. A leaking valve cover gasket can sneak it's way down and appear to be a rear seal.
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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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