There is also a very interesting Tech Talk article by Matt Erickson, Technical Manager of Passenger Car Light Truck products, about defining “severe service”. Many are unaware about factors that may contribute in making their driving habits considered “severe service” such as types of fuel and driving conditions. It is important to understand how AMSOIL tests products and why there may be different drain interval recommendations if a driver is in severe or normal service, even more so important for our distributors who make recommendations on types of applications that aren’t found in or tested in the US.