Not only do you offer unsupported bombastic opinions, but you have talking engines...did they tell you the facts?
The real facts are that all engines use oil---otherwise they would seize. Some use less than others for sure. Older engines which are driven relatively short distances often appear to use "no oil" because of the condensation of "blowby" products in the crankcase makes up the volume
I suggest you do a little research on the ever diminishing levels of Zinc Dialkyl Dithio Phosphate (ZDDP) in modern oil formulations driven by environmental requirements, and the consequential wear caused in flat tappet engines caused by its absence as there is a minimal, if any sacrificial lubricating surface between the cam lobe and the lifter. This in turn can lead to superheating of the point of impact and deterioration of the hardened surfaces with consequent increased wear...
Modern engines generally use roller tappets...no problems. But flat tappet engines are different and have specific requirements which may/may not be met by modern so-called "synthetic" oils which use different base stocks and additives ... like I said, do your research and especially read the tech info from the major after market cam manufacturers... and see a doctor about this need to ask an engine a question
cheers
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