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I run mystik synthetic 15-40 from tractor supply. I've ran rotella t6 and didn't like it.
 

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Currently running T6 in our 7.3's but considering a change since Shell is not exactly a stellar oil producer (I'm a mobil one valvoline fan)
I ran one change of the Valv synthetic diesel oil, no change from the shell, runs the same, same cost.
I am considering Delvac since I love Mobil one, I figure they probably make good diesel oil too?
 
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