I don't know about your 454 but in our 1980 gmc trucks 1 had a 427 and 1 had a 366. We used them hard in hot weather and a guy that worked on them told us to use 15/40 oil we put that in both and in a month the lifters we making noise . We changed back to 10/30 and in less then an hour the noise was gone. If it calls for 5/30 use it if it calls for 10/30 use that . The extra additives in my opinion are a waste of money if the oil needed it it would already be in there. We still have 1 of the trucks with 160000 miles on it and it uses very little oil. When using them at night and we would open the hood the manifold would be cherry red.
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Today's Featured Article - Tractor Implements and Their Use - by Curtis Von Fange. Dad was raised during the depression years of the thirties. As a kid he worked part time on a farm in Kansas doing many of the manual chores. Some of the more successful farmers of that day had a new time saving device called a tractor. It increased the farm productivity and, in general, made life easier because more work could be done with this 'mechanical beast'. My dad dreamed that some day he would have his own tractor with every implement he could get. When he reached his early sixties
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