Choosing a quality level for heavy-duty diesel oil beyond minimum mandated standards is a choice, not an absolute. What severity of service will your engines be undergoing? What kind of engine durability are you looking for? What is the age of your engine fleet? How long a drain interval do you want? What type of oil analysis will you be using at what interval? Will you be mixing old and new oils or do you always switch to the newer engine lubes? What’s the quality of your fuel? Its sulfur content? Cetane content? Acidity? What’s your climate like? What are your fuel economy goals? The answers to these questions will help you choose the proper lubricant quality level for your trucks or equipment. And Lubrizol’s core-booster system will ensure that you precisely meet those lubricant needs with flexibility, cost-efficiency and consistent quality anywhere in the world.