Motor oil weight after new top end?

What motor oil weight should I use when breaking in my new top end? I will probably use Rotella T 5-40W after break in but not sure if I should use 10-40W, 10-30W or something else when I break in my new top end. Does it make any difference for getting the rings seated in correctly? I will be using the hard break in method and I assembled the rings and piston dry.

What motor oil weight should I use when breaking in my new top end? I will probably use Rotella T 5-40W after break in but not sure if I should use 10-40W, 10-30W or something else when I break in my new top end. Does it make any difference for getting the rings seated in correctly? I will be using the hard break in method and I assembled the rings and piston dry.

I use regular dino oil 10/40 using the above method.

Ian

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