The 1968 service manual says to run 20w50 so that is what I run.
I run Royal Purple HPS 20w50. $50 +/- for oil and a filter is no big deal. That's less than it costs to fill the tank once a week. If I wanted to save money on gas and oil and ****, I'd drive a ******* Geo or Yugo!
You make the call.
This?
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Or this?
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