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Other threads aside, suggesting that people should use viscosity recommended by the manufacturer is not being a 'genius'. It's actually a prudent approach.
Thinking/suggesting that you know better than the engineers who designed and tested the engine might be considered being a 'know it all'.
Absent valid evidence, it's just an idea. Maybe a good one, maybe a terrible one, but it's your car, do what you want. If you want to have a serious discussion, go for it. But bring some facts.
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"A machine you build yourself is a vote for a different way of life. There are things you have to earn with your hands."
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