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This'll get you started. Between this, and the numerous references given, you should have reading material for a couple months. If that's insufficient, I'm sure a search engine will turn more studies up. https://www.nejm.org/doi/10.1056/NEJMoa2035389

Yes

Not really. One could say Stihl oil blows up engines. "I used Stihl, and my saw was cooked in a week" "What ratio did you use?" "It was about 50:1. I used an old measuring cup to measure it" "Huh... Do you know your cup measures right? Did you account for the oil stuck to the side after...

Science to me is simply proving your assertion. You make a claim, then test it. If the tests backup your claim, it becomes true until a competing claim refutes it by testing and proving their claim. Anything else is religion.