Best 20K oil

There is no "Best". It's the correct grade oil for your temperature & specs that meet your OEM Engine. Any of them that claim 20k is going to be solid oil. W/O UOA on a consistent basis you'd never know the statistical difference & even then they would all work well. I know that may not be what you wanted but that's the "Conclusion".
 
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There really is no final conclusion. Every vehicle and usage profile of said vehicle, plus environmental factors plays into how far you can take an OCI on whatever oil chose.
 
I have been 10K on my 2015 f150 v6 twin turbo full synthetic oil. I do notice it's quieter after an oil change.
 
With all the oil tests done with Blackstone, What is the final conclusion on the best 20 K oil?
You wont find data from that report that can sustain a conclusion in your question. They're essentially useless for your question.
 
There is no "Best". It's the correct grade oil for your temperature & specs that meet your OEM Engine. Any of them that claim 20k is going to be solid oil. W/O UOA on a consistent basis you'd never know the statistical difference & even then they would all work well. I know that may not be what you wanted but that's the "Conclusion".
So you would run Supertech 20K mile oil for 20k vs. say M1?
 
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