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The Chrysler manual was written before synthetic oils were designed for use in street vehicles. Viscosity was the main issue back then, and still should be today. Trust the engineers, synthetics work great in rice-burners and disposable grocery-getters. If you want to protect an old...
The main issue is synthetic vs. Non-synthetic. Viscosity is the optimum oil for use in a particular environment. Are you driving your hot rod to car shows on warm summer days or are you plowing snow in the U.P. with it? Basically just use conventional 140 or 80w90, GL-4 if you can get it...