[Drbrown]

I realize a lot of forum members here favor the 20w-50 oil viscosity but I have always used the lower viscosity 10w-30 detergent and change it every 1000 miles. My rebuilt 59AB has over 35,000 miles on it, doesn't burn oil, no leaking seals, and at idle get 70 lbs pressure when cold and about 20 lbs when hot.

My primary reason for using the 10w-30 is my northeast colder climate and not doing too much long-distance highway driving.