Hello-----I just purchased a 1953 Kaiser Manhattan. I would like to know that when I need the oil changed, what is the ideal weight oil?? Also, I was told to have the "mid" grade gasoline. In Colorado, we have 85, 87 and 91 Octane. So, do I assume I get the 87 Regular gas?? In CA, their gas is 87, 91, and 93 I believe........Thanks, Dan (a new Coloradoian and Kaiser owner)