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I would not worry about one quart used in 500 miles.
Our 29 does about the same. Compression is also 65 psi average for all four cylinders.
I run 20w-50 Walmart oil, four quarts with one 16 oz. Bottle of blue STP. That fills crank case to the full line on dip stick. We have very little dripping, but she will mark her spot.
Engine was rebuilt under 10,000 miles ago. Believe it or not, rebuilt in late 60’s. Enjoy.