The AMSOIL Corporate Website now features a new Heavy-Duty Product Guide. It provides product recommendations for a wide range of heavy-duty vehicles. The new guide covers engine oil, filters, transmission fluid, differential fluid, grease and coolant. It has recommendations for vehicles from 1999 to the present and will receive regular updates. For older vehicles, please contact Technical Services at 715-399-8324. Check out the new Heavy-Duty Product Guide here.