Regular basic maintenance? Engine design failure? In case you haven’t noticed, there’s an enormous amount of engine failures on the internet, especially on these forums, especially with AFM and all while using minimum required engine oil but none while using Amsoil or Redline. The answer to this can be simple and yet overlooked, especially with cheapskates, I’ve owned an enormous amount of trucks, mostly for my business and have definitely noticed a difference in smoother running engines when I switched to Amsoil, ZERO carbon build up, engine vibrations and the cost far outweighing the repairs etc etc. Sent from Above