Toyota USA recently posted an odd YouTube video — one that will ramp up the speculation.

Like most automakers (and companies in general here in 2021), Toyota USA has an official YouTube page. It functions mostly like you would expect — alerting Toyota buyers about new sales events and giving exciting walkarounds of, say, the new Sienna minivan. (Which, to be fair, is a damn good minivan.) But there was one post last week that was curious, to say the least: Toyota posted an “Engines: 101” explainer about diesel engines.
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