Old Daisy oil

I was gifted an old Daisy 111. I am going to start the cleanup process and was wondering about what type of oil to use in the oil hole in the barrel?
I had heard a NON detergent 30 weight motor oil would work. The problem is that I think a NON detergent 30 weight motor oil is hard to find now a days.
Does anyone have a brand name NON detergent 30 weight motor oil that they would recommend? Does it specify "NON detergent" on the label?
Is there any other oil you would recommend?
Thanks.