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My car with the built motor consumes the 10W-30, I'm hoping the 15W-50 will solve that issue.
Did the higher viscosity oil solve your oil problem? I was speaking with some engine builders who were educating me on windage as I told them I started to lose oil after my build AND I upped the viscosity to 15w-50 thinking it was blow by (it's not the turbo).
I am going to take a leap of faith down in viscosity soon as a test as it's easier than rechecking clearances, etc.