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Reply to "Which oil to use..."

Sorry if this topic is a repeat it was just that I went to a diesel truck mechanic shop and the guy was saying amzoil was king and that the amzoil rep was showing some type of shearing test that only that oil was passing.  I just googled it and found this and it goes back to bringing some reality to the shear test etc. on synthetic and Pennzoil as usual is in the front runners etc etc. 

As they say in the email community feel free to hit delete on that email you do not want to read...  

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