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National Clean Diesel Campaign (NCDC)

Working Together for Cleaner Air

Verification
Verified Technologies List

The lists below provide information about diesel retrofit technologies that EPA has approved or conditionally approved for use in engine retrofit programs and shows the percent reduction (of verified or tested levels) that EPA will recognize for emission reductions for each technology. Select the technology link in the list to learn more about the retrofit technology and its operating criteria. See the Technology Contact Page for contact information and links to the manufacturers.

 


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Verified Retrofit Technologies

The list below provides information on the emission reduction performance as verified by the EPA. By inclusion, EPA does not guarantee any performance or claims by the manufacturer, and the assigned reduction levels are only applicable when the technology is installed and used in accordance with the criteria described. EPA verification is not an evaluation of a product's safety or compliance with other regulatory requirements. Manufacturers, installers, fleets and operators must comply with all applicable local, state and federal safety regulations.

Manufacturer Technology Applicability Reductions (%)
PM NOx HC CO
BASF (formerly listed under Engelhard) CMX Catalyst Muffler Highway, heavy-duty, 4 cycle engines 20 n/a 50 40
Caterpillar, Inc. Caterpillar Locomotive Selective Catalytic Reduction System (SCR) System Caterpillar 3516, heavy duty, line-haul locomotive engine; originally manufactured to meet Tier 2 standards for model years 2010–2011 and remanufactured to meet Tier 1+ standards for model years 2012–2013; turbocharged with power ratings 2650 ≤ Horsepower ≤ 3005 10 75 90 70
Caterpillar, Inc. Diesel Particulate Filter (DPF) Nonroad, 4 cycle, non-EGR equipped, model year 1996-2005, turbocharged engines with power ratings 130 ≤ KiloWatts < 225 (174.2 ≤ Horsepower < 301.5) 89 n/a 93 90
Caterpillar, Inc. Emissions Upgrade Group Caterpillar model 3306 diesel engines for nonroad applications with model years from 1970 to 1995 with mechanical direct fuel injection 22 37 71 13
Caterpillar, Inc. Emissions Upgrade Group Caterpillar model 3406 diesel engines for nonroad applications with model years from 1973 to 1995 with mechanical fuel injection Tier 1 Level (nonroad)
Caterpillar, Inc. Marine Engine Emissions Upgrade Group Kit #1 (MUI to EUI) Caterpillar 3512 diesel engines for non-road, marine applications, model year 1994 – 2006 with mechanical direct fuel injection 35 35 18 60
Caterpillar, Inc. Marine Engine Emissions Upgrade Group Kit #2 (MUI to Tier 1) Caterpillar 3508, 3512, and 3516 (large cam bore) diesel engines for non-road, marine applications, model year 1994 – 2006 45 Tier 1 Level (marine) 28 65
Caterpillar, Inc. Marine Engine Emissions Upgrade Group Kit #3 (MUI to Tier 2) Caterpillar 3508, 3512, and 3516 (large cam bore) diesel engines for non-road, marine applications, model year 1994 – 2006 Tier 2 Level (marine)
Caterpillar, Inc. Marine Engine Emissions Upgrade Group Kit #4 (EUI to Tier 1) Caterpillar 3508, 3512, and 3516 (large cam bore) diesel engines for non-road, marine applications, model year 1994 – 2006, originally equipped with electronic unit injection (EUI) and rated at 1600 or 1800 rpm Tier 1 Level (marine) – NOx only
Caterpillar, Inc. Marine Engine Emissions Upgrade Group Kit #5 (EUI to Tier 2) Caterpillar 3508, 3512, and 3516 (large cam bore) diesel engines for non-road, marine applications, model year 1994 – 2006, originally equipped with electronic unit injection (EUI) and rated at 1600 rpm Tier 2 Level (marine)
Caterpillar, Inc. Marine Engine Emissions Upgrade Group Kit #6 (Tier 1 to Tier 2) Caterpillar 3508, 3512, and 3516 (large cam bore) diesel engines for non-road, marine applications, model year 1994 – 2006, Tier 1 engine and rated at 1200, 1600, or 1800 rpm (varies by model) Tier 2 Level (marine)
Clean Diesel Technologies, Inc. (CDTi)
(Formerly Engine Control Systems Limited)
AZC Purimuffler or AZC Purifier Diesel Oxidation Catalyst (DOC) Highway, heavy-duty, 4 cycle engines 1991 through 2006 20 n/a 50 50
Clean Diesel Technologies, Inc. (CDTi)
(Formerly Engine Control Systems Limited)
AZC Purimuffler or AZC Purifier Diesel Oxidation Catalyst (DOC) plus CDTi Closed Crankcase Ventilation (CCV) System Highway, heavy-duty, mechanically or electronically injected, turbocharged or naturally aspirated, originally manufactured from 1991 through 2006 model years which meet a 5 or 4 g/bhp-hr NOx standard 25 n/a 50 50
Clean Diesel Technologies, Inc. (CDTi)
(Formerly Engine Control Systems Limited)
Purifilter - Diesel Particulate Filter (DPF) Environmental Technology Verification Logo Highway, heavy and medium heavy-duty; Urban Bus; 4-cycle; model years 1994 - 2003; turbocharged or naturally aspirated; non-EGR engines 90 n/a 85 75
Clean Diesel Technologies, Inc. (CDTi)
(Formerly Engine Control Systems Limited)
Purifilter EGR Diesel Particulate Filter (DPF)

Highway; light, medium and heavy heavy-duty engines (EGR and non-EGR) certified in model years 1993-2010 and listed in Attachment A

90 n/a 90 80
Clean Diesel Technologies, Inc. (CDTi)
(Formerly Engine Control Systems Limited)
Purifilter OR Diesel Particulate Filter (DPF) for Non-Road Applications System Nonroad, Tier 1 or Tier 2 or Tier 3 diesel engines certified with a maximum PM level of 0.20 g/bhp-hr with power ratings 100 ≤ Horsepower ≤ 603hp 90 n/a 90 85
Clean Diesel Technologies, Inc. (CDTi)
(Formerly Engine Control Systems Limited)
Purifilter Plus - Diesel particulate filter (DPF) on the engine, electrical panel for active regeneration at the garage/maintenance yard Highway; heavy, medium, and light heavy-duty; Urban Bus; 4-cycle; model years 1994 - 2006; turbocharged or naturally aspirated; non-EGR engines 90 n/a 85 75
Clean Diesel Technologies, Inc. (CDTi)
(Formerly Engine Control Systems Limited)
Purifilter Plus M - Diesel Particulate Filter (DPF) on the engine, electrical panel for active regeneration at the garage/maintenance yard Highway; light, medium, and heavy heavy-duty EGR and non-EGR engines, not originally certified or equipped with DPF, originally manufactured from 1994-2010 and listed in Table A
* HC Emission reduction level for DOC equipped engines
**HC Emission reduction level for non-DOC equipped engines
90 n/a  0*
70**
75
Cummins Emission Solutions
Cummins Emission Solutions & Cummins Filtration Diesel Oxidation Catalyst (DOC) and Closed Crankcase Ventilation (CCV) System Environmental Technology Verification Logo Highway, heavy-heavy and medium-heavy duty, 4 cycle, non-EGR, model year 1991 - 2003, turbocharged or naturally aspirated engines 302 n/a 74 50
Donaldson
Semi-Active Electric Filter for Non-Road Applications (NR-SEF) System Nonroad, model year 1996-2010, with power rating between 100 and 400 hp and particulate matter (PM) certification levels less than 0.25 g/bhp-hr 90 n/a 95 90
Donaldson
Low NO2 Diesel Particulate Filter for Non-Road Applications (NR-LNF DPF) System Non-road, Tier 1 or Tier 2 diesel engines certified with a maximum PM level of 0.25 g/bhp-hr with power rating 75 ≤ Kilowatts < 450 (100.6 ≤ Horsepower < 603.4) 90 n/a 95 90
Donaldson
Series 6000 Diesel Oxidation Catalyst (DOC) & Spiracle Closed Crankcase Filtration system Environmental Technology Verification Logo Highway, heavy heavy- and medium heavy-duty, 4-cycle, non-EGR, model year 1991 - 2003, turbocharged or naturally aspirated engines 25 to 332 n/a 50 to 52 13 to 23
Donaldson
Series 6100 Diesel Oxidation Catalyst (DOC) Environmental Technology Verification Logo Highway, heavy heavy- and medium heavy-duty, 4-cycle, non-EGR, model year 1991 - 2003, turbocharged or naturally aspirated engines 20 to 26 n/a 49 to 66 38 to 41
Donaldson
Series 6100 Diesel Oxidation Catalyst (DOC) & Spiracle Closed Crankcase Filtration system Environmental Technology Verification Logo Highway, heavy heavy- and medium heavy-duty, 4-cycle, non-EGR, model year 1991 - 2003, turbocharged or naturally aspirated engines 28 to 322 n/a 42 31 to 34
Donaldson
Series 6400 Diesel Oxidation Catalyst (DOC) & Spiracle Closed Crankcase Filtration System Highway, heavy-heavy and medium-heavy duty, 4 cycle, non-EGR, model year 1991 - 2003, turbocharged or naturally aspirated 282 n/a 50 23
Foss Maritime / AKA XeroPoint Hybrid Tugboat Retrofit System Harbor tugboat vessels with auxiliary generator engines with rated horsepower range between 100 and 750 hp and main propulsion engines up to 5,000 hp each 25 30 15 35
International Truck & Engine Corp. Green Diesel Technology-Low NOx Calibration plus Diesel Oxidation Catalyst (DOC) with Ultra Low Sulfur Diesel (ULSD) Highway, light heavy-duty, 4-cycle, Navistar/International engines, model years 1999 - 2003 in the following families:
XNVXH0444ANA, YNVXH0444ANB,
1NVXH0444ANB, 2NVXH0444ANB,
3NVXH0444ANB
0 to 10 25 50 10 to 20
Johnson Matthey Advanced Catalyzed Continuously Regenerating Technology (AdvCCRT) System Highway, 4-cycle; light-, medium-, and heavy- heavy duty diesel engines including turbo-charged or naturally aspirated, EGR and non-EGR, and originally manufactured from 2002 through 2006 model years 90 n/a n/a 50
Johnson Matthey CEM™ Catalytic Exhaust Muffler and/or DCC™ Catalytic Converter Highway, heavy- duty, non-urban bus, 4-cycle, EGR equipped model year 2003, EGR and non-EGR model year 2004 – 2006 turbocharged or naturally aspirated diesel engines certified without a diesel oxidation catalyst 20 n/a 50 40
Johnson Matthey CEM™ Catalytic Exhaust Muffler and/or DCC™ Catalytic Converter Highway, heavy- duty, non-urban bus, 4-cycle, non-EGR, model year 1988 – 1997 turbocharged or naturally aspirated diesel engines 20 n/a 50 40
Johnson Matthey CEM™ Catalytic Exhaust Muffler and/or DCC™ Catalytic Converter Highway, heavy- duty, non-urban bus, 4-cycle, non-EGR, model year 1998 – 2003 turbocharged or naturally aspirated diesel engines 25 n/a 50 40
Johnson Matthey Continuously Regenerating Technology3 (CRT3) Particulate Filter Highway, medium and heavy heavy-duty, 4-cycle, non-EGR, model year 1994 - 2006, turbocharged or naturally aspirated engines 90 n/a 93 72
Johnson Matthey Selective Catalytic Reduction Technology (SCCRT) On-highway, 4-cycle, EGR and non-EGR, 250-500 hp heavy-duty diesel engines, originally manufactured from model years 1998 through 2006 90 70 90 85
Johnson Matthey Selective Catalytic Reduction Technology (SCRT) On-highway, 4-cycle, non-EGR, 250-500 hp heavy-duty diesel engines, originally manufactured from model years 1994 through 2002 90 70 95 90
MJ EcoPower Hybrid Systems, Inc.
EcoCrane Hybrid System Nonroad, Tier 0, Tier 1 or Tier 2 nonroad diesel engines on rubber tired gantry cranes 74 84 96 71
Nett Technologies, Inc. BlueMAX™ 100 Urea-Based Selective Catalytic Reduction (SCR) System Nonroad, 4-cycle, non-EGR diesel engines between 75–370 kW power ranges, originally manufactured from 1996 through 2008 and originally certified without a catalyst to EPA Tier 1, 2, or 3 standards 0 65 90 85
Nett Technologies, Inc. BlueMAX™ 300D Selective Catalytic Reduction (SCR) System 4-cycle, constant speed engines, rated at 100-750hp for NR and Stationary applications, certified to Tier 1, 2, or 3 25 80 90 90
Nett Technologies, Inc. MD300 Diesel Oxidation Catalyst (DOC) 4-cycle, constant speed engines, rated at 100-750hp for NR and Stationary applications, certified to Tier 1, 2, or 3 20 0 80 90
Various Biodiesel (1-100%) Highway, heavy-duty, 2 & 4-cycle 0 to 47 -10 to 0 0 to 67 0 to 47
Various Cetane Enhancers Highway, heavy-duty, 4-cycle, non-EGR-equipped engines n/a 0 to 5 n/a n/a

Note: Reductions for after-treatment devices are based on installation of retrofit technologies on engines that were originally produced without diesel oxidation catalysts or diesel particulate filters.

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