Engine oil

[Eliasson]

What type of enginge oil do you use? Mineral or syntetic. What viscosity works best in your area (usual air temperature when you are driving the car).
What is your experience from using different oil types?

I'm trying to figure out what kind of oil is the best for my engine.
I have a 1835 with dual 44 webers and CB performance street eliminator heads.
It would be nice if you could share your experience.