In my old 24valve I ran rotella T6, my new truck I run amsoil and go the 15k miles (oil indicator hits 0% at 14,500+/-). Typically in all of my work trucks and equipment we use Rotella, older leaky (detroit diesel LOL) stuff gets 15w40 and short changes 3-5000mi and non leaky gets T6 and 5000+mi changes.
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