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 - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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