What does it take to make 20k mile oil?
One of my fravorite You Tuber's, Jason Fenske, at Engineering Explained gives us an inside look at what kind of R&D it takes to make a 20k mile oil. Notice the 500k test miles they put on the Silverad...
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Modern synthetic oil does not wear out, it gets contaminated. If you add micro-filtration it can go more than 25,000 miles. A semi has gone 1 million miles with the same oil. It was filtered and every couple of years they put in some additives.
