Dropping to a lighter oil will likely not help, in fact it might be worse.
The very high oil pressure may be a contributor. What are you calling very high? Possibly the relief valve is stuck, assembled wrong, or was tampered with trying to get better pressure at idle. Do some research as to what it should be, be sure the gauge is right. If it is excessively high, that needs to be corrected. High pressure can wash out the bearing babbet, cause oil pump failure, or damage other components.
Other ways to slow a leaking crank seal is to be sure the crankcase vent is clean and working properly. Another trick is running the oil level a quart low. Many older engines will leak excessively if filled to the recommend level. Any doubt about the capacity, or it having the proper dip stick?
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Today's Featured Article - New Life for an Old Allis - by Tyler Woods. My friend Jon, has an old '39 Allis Chalmers B. He thought it a marginal tractor that had long since served its time. She smoked terribly and never had much power but he couldn't afford another so he was limping along with what he had. Jon's Allis has a small front loader and though it doesn't carry much, it serves his needs. It was the hard starting and low power that made him think it was time to replace the old girl. Jon called me to help him discover why his tractor wouldn't start
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