I know that I have to use mineral oil for break in (read lots about it already). Mattituck says straight weight or multi viscosity mineral is okay. I will be doing most of the ground running and break-in in spring in Wisconsin, in which ambient temperatures can vary between 45-75?F. What oil would be best for me? I see that Aeroshell has 65, 80, & 100 weight and Exxon and Phillips both have 20W50 Mineral. What do you say?