Off-road equipment industry publishes Tier 4 Clean Diesel FAQs

Five leading off-road equipment industry associations address frequently asked questions about Tier 4 technology.

The five leading off-road equipment industry associations have released answers to frequently asked questions about Tier 4 technology – the next generation of clean diesel emissions standards established by the US. Environmental Protection Agency (EPA) that apply to new diesel engines used in off-road equipment beginning in 2011.

The associations that collaborated with the Diesel Technology Forum (DTF) on the Tier 4 report — "Clean Diesel Technology for Off-Road Engines and Equipment: Tier 4 and More" — are:

  • Associated Equipment Distributors (AED)
  • Association of Equipment Manufacturers (AEM)
  • American Rental Association (ARA)
  • Farm Equipment Manufacturers Association (FEMA)
  • North America Equipment Dealers Association (NAEDA)

"As we approach critical dates for Tier 4 implementation, many dealers and diesel equipment users have a number of questions about the new regulations," said Allen Schaeffer, the executive director of the DTF. "In collaboration with our other industry partners, we hope this information will help ease the transition for prospective equipment owners, dealers and rental agencies and others in the off-road industry during the implementation of these new regulations"

Among the questions addressed in the report are:

  • How Are the New Tier 4 Engines Different From Previous Engines?
  • Do the New Tier 4 Engines Require Different Fuel?
  • How Will Tier 4 Engines Affect the Value of My Trade-Ins?
  • What Additional Technician Training and Certifications Are Going to Be Needed?
  • What Additional Dealer Diagnostic Equipment Will Be Needed?
  • Can I Use Biodiesel in the New Tier 4 Emissions Engines/Equipment?
  • What are Other Emissions-Related Issues We're Likely to Be Hearing About in the Future?

The paper includes emissions tables, technical graphics and other resources. These and other FAQs can be found at:

The Diesel Technology Forum is a non-profit national organization dedicated to raising awareness about the importance of diesel engines, fuel and technology. Forum members are leaders in clean diesel technology and represent the three key elements of the modern clean-diesel system: advanced engines, vehicles and equipment, cleaner diesel fuel and emissions-control systems. For more information visit