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 - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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