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 - Talk of the Town: How to Remove a Broken Bolt - by Staff. Another neat discussion from the Tractor Talk Discussion Forum. The discussion started out with the following post: "I have an aluminum steering gear housing with a bolt broken off in it. The bolt is about a 3/8" x 1 1/2" bolt. I've already drilled the center of the bolt out with about 7/64" drill bit the entire length of the bolt. Only one end of the bolt is visible. I tried to use an easy out but it wasn't budging and I didn't want t
... [Read Article]
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