i'd use any oils that have a shear stability (viscosity index) of 150 or higher for 10w40. valvoline maxlife, phillips 66 , kendal, and super 76 are some i know of. i believe pretty much all synthetics are at least this good... but do you want to run synthetics in this dinosaur, i believe their ultra-pure bases and high tech additives are worse for the gaskets and even cause glazing on the bores.
my advice: look up some oils available to you, find an affordable dino brand with good shear stability and change it regular. good luck and by the way just cause you are using the 10w40 as a reference to compare viscosity indexes, i'd only run that in the winter use 15-40 or 20 50 or a mix of the two in all other seasons... just my cent and half.
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