Amsoil vs. Hot Shot’s Blue Diamond: Which Oil Reigns Supreme?

See Amsoil and Hot Shot's motor oils put to the test, head to head. Project Farm's in-depth analysis compares wear protection, oxidation, cold flow, and additives to reveal the best choice for your engine.See Amsoil and Hot Shot's motor oils put to the test, head to head. Project Farm's in-depth analysis compares wear protection, oxidation, cold flow, and additives to reveal the best choice for your engine.