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Oobleck fork oil. Remember playing with Oobleck as a kid? Any petrochemical engineers here? Typically Oobleck was made with 2 parts cornstarch and one part water. It’s a non-Newtonian fluid. Under low stress it was more liquid but under heavy stress was more solid. See what I’m getting at...

Doing further checking it seems the chart I was using is clearly wrong. Disregard everything I said and call me an idiot.

To those more informed than me - what am I missing? Looking at the manufacturer’s specs regarding 75W140 gear oils, specifically the 100*C rating in centistokes I find several that fall well within the SAE 90 range rather than 140 at the high end. Mobil 1 was the thinnest of all. At the other...