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Originally Posted by way2old
We run 15w40 in all the Fords we have. Since 92 we have had no oil related failures that are common in the "real world". Haven't lost timing tensioners, cams, bearings or pumps. I am not advocating to vary from manufacturer specs, just saying we must be really lucky. We have the normal head leaking and gaskets, but no major problems.
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What about the common oil burning these engines tend to do? Does the 15W40 help any? What brand? I run Rotella T in my F350 PSD, and I KNOW it is good oil, every blackstone test came back with outstanding results with high miles on each sample.