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I don't pretend to be an expert or even an enthusiast when it comes to petroleum, but for instance, synthetic oil is a thing now that wasn't a thing 60 years ago. Now, I'm not saying to use synthetic oil, just pointing at it as an example how technology has created something new. This is less...

Was recently reading up on engines and came across this: https://www.steelsoldiers.com/threads/how-to-improve-mpg-of-lds-465-1a-engine.87915/post-1507272 See post #23 & 25. Now, there is some not-so-little bit on here about what oil to use, but most of those threads are 10+ years old, and...