Hey guys I know lotsa yall drive diesel trucks; anyone know if Mobil Delvac oil is as good as Rotella T? I have a 2005 Dodge/Cummins & I just got a flier from O'reilly that they have buy 1 gallon for 11.99 & get one free J Opinions appreciated! Lew Best near Waco, TX Please note new email addy lew at lewslittlefarm.com