Its time for an oil change on my 84 CJ and I am embarrassed to admit that I don't remember the brand and or weight oil I used at the last change? Can anyone recommend brand and weight for a 1984CJ with 63K miles on the original AMC150 4Cyl engine..? The CJ only gets 1-2K miles a year... Any help would be greatly appreciated as I plan to stick with this recommendation moving forward as I assume there is something specifically made for older vehicles.