For your vintage '56 Erude service engine at cruise and some WOT any name brand name TCWIII will do you well. I use Pennzoil Marine XLF semi syn, burns fairly clean and I use it at 16:1 with E free gas in my vintage race engines that see 7000 and I have had them since the '70's and still mechanically in great shape. Higher revs need more oil and oil is cheaper than parts for me. For you 40:1 or 32:1 will do no harm with a quality brand TCWIII. IMO expensive 100% syn is not necessary for your service engine. Oils blended for Injection are thinner for modern engine requirements, I prefer the non injection higher viscosity oils for the vintage non fueli engines. Your choice.
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