Castrol Synthec or Mobil 1?

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been running mobil 1 in my 99 Z-71 since 03. It has over 200+K miles now and still runs strong. 5000K to 6 max to the oil changes I run it in just about everything.


In one of my mustangs, I got about .2 tenths quicker et's out of mobile 1 synthetic over valvoline durablend
 
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