Totally Dissapointed!!!!!

C130 Chief said

Look in you owners manual and see what MOPAR called for. Face it, these engines ran long periods of time using the oils available in the 70's and 80's. Lubricant technology has come a long way since then. Compare todays oils to the best oil available when these cars were made. You simply can't buy oil that bad today.

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Oil has changed a lot since these cars were new. And not for the better for the old/flat tappet cars. Hense why diesel oil is very popular due to a high zinc content that is better suited for our flat-tappet cams...Many of the new oils are of course taylored to newer cars. It's very wise/suggested to break in any flat-tappet motor these days with diesel oil due to the break-in of the cam being so hard on the cam/lifters.