5W-20 and 5W-30 in Ford engines

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So what does 5W-20 shear into? 5W-10 land?
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Based on my experience, the 5w20 has been much less likely to shear. Of course, most of the 5w30 oils I've run recently also have not sheared down. Better base stocks anyone?
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not sure...running Super Tech 5W30 in the civic and having a used oil analysis completed next week after a 4k OCI.
 
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