I'm not rewriting facts. Words/terms have accepted meanings in context. In the context of engine and equipment mechanics - the terms "conventional oil" and "synthetic oil" commonly connote "oil made from petroleum" and "oil NOT made from petroleum." Arguments outside that scope are just semanitcs.
And yes, American English is a "living language" which means it constantly changes. But, we are not talking in common terms. We are discussing terms that have technical implications in the context of mechanics.
So, yes . . some type III oils have similar characteristics to type IV in certain test scores. So what? The same can be said for several types of conventional petroleum oils. Many have low/high temp viscosities, pour points, flash points, and wear-scar test scores that match synthetics. What the heck does that prove? Titles for two different things don't have merit if those things behave in similar fashion?
My complaint is . . . if somebody wants to buy synthetic oil - they should be able to assume that . . . when the label reads "full synthetic oil" . . . that oil is actually made from a synthetic, non-petro base.
Are you also looking to change the denotation of the word "synthetic?" In science, it usually carries the meaning of something made "artificially." Seems petro-oil, made from petro-oil does not come close to that meaning.
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