Download Fuel Efficiency Brochure Here are testimonials from Volvo customers. You’ll hear their candid comments about working with the 2010 Volvo SCR engines — and you’ll get answers to some of the questions you’ve been wondering about. You’ll learn how easy it is to fill the DEF tank, and how simple the system is to operate. Then out on the road, you’ll hear how their Volvo SCR trucks perform with comfort, power and functionality to spare.