5W-30 will be fine. The oil is as heavy as straight 30W when you get it up to operating temperature - are you afraid to put straight 30W in it in the summer? The 5W means the thickness of the oil at 30 degrees (winter viscocity) is same as it would be if it were 5 weight oil at 30 degrees - still much thicker than 30 weight at operating temp.
When you H was first designed most motor oils did not have zinc added, in fact they were pretty basic with few additives of any kind. In the late 1940s companies began to zinc dialkyldithiophosphate.
Today the zinc issue doesn't apply to engines like the H as they don't have near the piston ring-to-cylinder pressure that high performance engines do (the main reason for the fear of modern oils). After an engine is broke in the the need for zinc is greatly reduced. I bet your H engine is broke in.
In the 1970s and early 1980s there used to be 1,400-1,500 zinc ppm in motor oils (levels were lower before and after that) and current levels are in the 600 to 800 ppm range.
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