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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Go with what your Oil Sample people tell you. Not taking samples you say? They cost $25.00 and engine block for a Duramax Chevy cost $12000. Think about it.
