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.
SmartWay Technologies
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. | 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. | 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 |
| Clean Diesel Technologies, Inc. (CDTi) (Formerly Engine Control Systems Limited) |
Purifilter EGR Diesel Particulate Filter (DPF) | Highway; light, medium, and heavy heavy-duty EGR engines, not originally certified or equipped with DPF, originally certified from 2002-2010 and listed in Attachment A enclosed with this letter. | 90 | n/a | 90 | 85 |
| 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 1994 through 2006 | 20 | n/a | 50 | 40 |
| 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 1994 through 2006 model years which meet a 5 or 4 g/bhp-hr NOx standard | 25 | n/a | 50 | 40 |
| Clean Diesel Technologies, Inc. (CDTi) (Formerly Engine Control Systems Limited) |
Purifilter - Diesel Particulate Filter (DPF)  |
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 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 | 90 | n/a | 30 | 75 |
| Clean Diesel Technologies, Inc. (CDTi) (Formerly Engine Control Systems Limited) |
AZ Purimuffler Diesel Oxidation Catalyst (DOC) with Low Sulfur Diesel Fuel (LSD) |
Highway, medium heavy-duty, 4-cycle, model years 1991 - 2003 Cummins and Navistar/International engines originally manufactured with no after treatment, turbocharged or naturally aspirated, non-EGR engines | 40 | n/a | 70 | 40 |
| Clean Diesel Technologies, Inc. (CDTi) (Formerly Engine Control Systems Limited) |
AZ Purimuffler Diesel Oxidation Catalyst (DOC) with CDTi Closed Crankcase Ventilation (CCV) system with Low Sulfur Diesel Fuel (LSD) |
Highway, light heavy-duty or medium heavy-duty, 4-cycle, mechanically or electronically injected, turbocharged or naturally aspirated, originally manufactured from 1991 through 2004 model years which meet a 5 or 4 g/bhp-hr NOx standard with open crankcase ventilation and no after treatment engines | 402 | n/a | 75 | 60 |
| Cummins Emission Solutions |
Cummins Emission Solutions & Cummins Filtration Diesel Oxidation Catalyst (DOC) and Closed Crankcase Ventilation (CCV) System |
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 |
Series 6000 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 engines | 25 to 332 | n/a | 50 to 52 | 13 to 23 |
| Donaldson |
Series 6100 Diesel Oxidation Catalyst (DOC) |
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 |
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 |
| 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 | 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 |
| 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 | 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 | 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 | 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 |
| Lubrizol | PuriNOx Water emulsion fuel |
Highway & Nonroad, heavy-duty, 2 & 4-cycle | 16 to 58 | 9 to 20 | -30 to -120 | -35 to 33 |
| 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 |
| 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.
Related Information and Links:
- Cleaire LongMile Filter Notice (PDF) (1 pg, 70K, EPA-420-B-12-067a, December 2012)
- Donaldson Diesel Multi-stage Filter (DMF) Safety Notice (PDF) (1 pg, 170K, EPA-420-B-10-032, July 2010)
- Emissions from Platinum-based Fuel Additives General statement (PDF) (1 pg, 110K, EPA-420-B-08-014, July 2008)
- Formerly Verified Technologies: Technologies removed from the list.
- Nitrogen Oxide (NO2)Emission at Limits: Technologies listed above meet the current NO2 requirements.
- Announcement letter (PDF) (2 pp, 68K, EPA-420-B-08-005, December 2007)
- Clarification letter (PDF) (2 pp, 129K, EPA-420-B-08-015, September 2008)