I would ask your engine overhauler what he recommends.
Many years ago when I ran a R1340's on my spray plane, the overhauler was using Phillips 25W-60 on the test cell, and on his recommendation, I continued to use it. The engine was seated for the most part from the test cell run, and settled in very quickly. Usually an overhauled engine would use a pint/hr or a little more, which I was happy with. I did run a filter and changed the oil/filter every 50 to 75 hours. The engines were never abused, but did not lead a low power life either. When I started a load and was heavy I would begin at 30"@ 2050 rpm. Coming back empty I would be down to 24" and 1850 rpm. I would usually overhaul about 1200 hours. I always had better luck with the last half of an overhaul than the first half!
Just my experiences. Good luck!
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