𝗠𝗜𝗡𝗜𝗡𝗚 This CAT D9 had major emissions. After dosing with Fuel Ox® with Combustion Catalyst, the emissions and smoke decreased dramatically. Fuel Ox® reduces soot by over 50%, CO2 20%, NOx 10%. Fuel Ox® reduces DPF regenerations by as much as 50% or more.