We are talking about cars. The only choices for oil is the API rating (or one of the other similar industry ratings) and the multi-viscosity rating. Engines with variable valve timing mechanics require specific weight oil. Not clear why someone would want to second guess that but do as you want since it is not my problem. Feel free to argue with someone else.
Quote:
Originally Posted by CoachKandSportsguy
I don't know under what constraints the engineer designed, there always are, nor the marketing and legal review the manual went through to minimize legal exposure. The maintenance engineers have to keep the machine going and sees all the constraint issues which the design engineer can't possibly design for within the constraints. . having lived and worked with a family of design and maintenance engineers, with all different types of engines and gears, that's who I listen to. .
but if you think that's arbitrary, then the only possible correct answer is in the manual.
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