I have to agree with george morrison. The advertised effect of MT10 is that it electrically/magnetically "alligns" the polarity of the metal, making it more resistant to wear. This in itself could be a VERY bad thing for the Duramax. The cylinders of the Duramax engine are "induction hardened". This means that the polarity of the metal is already "alligned". I don't think it would be a good idea to add anything that claims it messes with this process, whether or not it can actually do this.