This proposal was prepared by the experts from the informal Heavy-Duty Dual Fuel (HDDF) Task Force within the GFV informal working group in order to enable the type approval of new EURO VI heavy duty dual-fuel engines and vehicles.

This document proposes to add the use of poly-alpha-olefin filters and to correct an error in the particle number measurement diagram in UN Regulation 49.

Progress report of the informal group working on heavy-duty dual-fuel vehicle provisions in UN Regulations 49, 85, and 115.