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Verified Technologies List
Related Information
This table summarizes all the diesel retrofit technologies that the U.S. Environmental Protection Agency (EPA) has approved for use in engine retrofit programs. Select the manufacturer link to learn more about the retrofit technology and its operating criteria. The table shows the percent reduction (of verified or tested levels) that EPA will recognize for emission reductions for each technology.
See the retrofit manufacturers contact page for more information on these manufacturers. See also Idle Reduction Technologies Verified for Funding Under the National Clean Diesel Campaign.
General statement regarding emissions from platinum-based fuel additives (PDF) (1 pg, 108K, EPA420-B-08-014, July 2008).
You will need Adobe Reader to view some of the files on this page. See EPA's PDF page to learn more.
| Manufacturer | Technology | Applicability | Reductions (%) | |||
|---|---|---|---|---|---|---|
| PM | CO | NOx | HC | |||
| Caterpillar, Inc. | Catalyzed Converter/Muffler (CCM) | Highway, heavy-heavy and medium-heavy duty, 4 cycle, non-EGR, model year 1998 - 2003, turbocharged or naturally aspirated engines | 20 | 20 | n/a | 40 |
| Caterpillar, Inc. | Diesel Particulate Filter | Nonroad, 4 cycle, non-EGR equipped, model year 1996-2005, turbocharged engines with power ratings 130 ≤ KiloWatts < 225 (174.2 ≤ Horsepower < 301.5) | 89 | 90 | n/a | 93 |
| Caterpillar, Inc. | Emissions Upgrade Group | Caterpillar model 3306 diesel engines for nonroad applications with model years from 1988 to 1995 with mechanical direct fuel injection. | 22 | 13 | 37 | 71 |
Clean Diesel Technologies, Inc. |
Platinum Plus Purifier System (fuel borne catalyst plus DOC) |
Highway, medium heavy- and heavy heavy-duty, 4 cycle, model year 1988 - 2003, turbocharged or naturally aspirated engines | 25 to 50 | 16 to 50 | 0 to 5 | 40 to 50 |
| Clean Diesel Technologies, Inc. |
Platinum Plus Fuel Borne Catalyst/Catalyzed Wire Mesh Filter (FBC/CWMF) System | Highway, medium heavy-duty, 4 cycle, model year 1991 - 2003, non-EGR, turbocharged or naturally aspirated engines | 55 to 76 | 50 to 66 | 0 to 9 | 75 to 89 |
| 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 | 30a | 50 | n/a | 74 |
| Donaldson |
Series 6000 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 33 a | 13 to 23 | n/a | 50 to 52 |
| Donaldson |
Series 6100 DOC | Highway, heavy heavy- and medium heavy-duty, 4 cycle, non-EGR, model year 1991 - 2003, turbocharged or naturally aspirated engines | 20 to 26 | 38 to 41 | n/a | 49 to 66 |
| Donaldson |
Series 6100 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 32 a | 31 to 34 | n/a | 42 |
| Engelhard | DPX Catalyzed Diesel Particulate Filter | Highway, heavy-duty, 4 cycle, model year 1994 - 2002, turbocharged or naturally aspirated engines | 60 | 60 | n/a | 60 |
| Engelhard | CMX Catalyst Muffler | Highway, heavy-duty, 2 cycle engines | 20 | 40 | n/a | 50 |
| Engelhard | CMX Catalyst Muffler | Highway, heavy-duty, 4 cycle engines | 20 | 40 | n/a | 50 |
| Engine Control Systems |
Purifilter - Diesel Particulate Filter | Highway, heavy and medium heavy-duty; Urban Bus; 4 cycle; model years 1994 - 2003; turbocharged or naturally aspirated; non-EGR engines | 90 | 75 | n/a | 85 |
| Engine Control Systems | AZ Purimuffler or AZ Purifier Diesel Oxidation Catalyst with ECS closed crankcase ventilation (CCV) system with Low Sulfur Diesel Fuel (30 ppm S max) |
Highway, 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 aftertreatment engines | 40a | 60 | n/a | 75 |
| Engine Control Systems | AZ Purimuffler or AZ Purifier Diesel Oxidation Catalyst with Low Sulfur Diesel Fuel (30 ppm S max) |
Highway, medium heavy-duty, 4 cycle, model years 1991 - 2003 Cummins and Navistar/International engines originally manufactured with no aftertreatment, turbocharged or naturally aspirated, non-EGR engines | 40 | 40 | n/a | 70 |
| Engine Control Systems | AZ Purimuffler or AZ Purifier Diesel Oxidation Catalyst with Low Sulfur Diesel Fuel (30 ppm S max) |
Highway, heavy heavy-duty, 4 cycle, model years 1991 - 1993 Cummins engines originally manufactured without exhaust aftertreatment, turbocharged or naturally aspirated, non-EGR engines | 35 | 40 | n/a | 70 |
| Engine Control Systems | AZ Purimuffler AZ Purifier |
Highway, heavy duty, 2 cycle engines | 20 | 40 | n/a | 50 |
| Engine Control Systems | AZ Purimuffler AZ Purifier |
Highway, heavy duty, 4 cycle engines | 20 | 40 | n/a | 50 |
| International Truck & Engine Corp. | Green Diesel Technology-Low NOx Calibration plus Diesel Oxidation Catalyst 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 | 10 to 20 | 25 | 50 |
| [Johnson Matthey]b | [Partial Continuously Regenerating Technology2 (PCRT2) Particulate Filter]b | [Highway, heavy-heavy and medium-heavy duty, 4 cycle, non-EGR, model year 1988 - 1993, turbocharged or naturally aspirated non-urban bus engines]b | [50]b | [60]b | n/a | [80]b |
| Johnson Matthey | Catalyzed Continuously Regenerating Technology (CCRT) Particulate Filter | Highway, heavy-duty, urban bus, 4 cycle, non-EGR model year 1994 - 2006, turbocharged or naturally aspirated engines. | 90 | 85 | n/a | 95 |
| Johnson Matthey | Continuously Regenerating Technology (CRT) Particulate Filter | Highway, heavy-duty, 4 cycle, model year 1994 - 2006, turbocharged or naturally aspirated engines | 90 | 85 | n/a | 95 |
| Johnson Matthey | CEM™ Catalytic Exhaust Muffler and/or DCC™ Catalytic Converter | Highway, heavy-duty, non-urban bus, 4 cycle, non-EGR model year 1991 - 2003, turbocharged or naturally aspirated engines | 20 | 40 | n/a | 50 |
| Johnson Matthey | CEM Catalyst Muffler | Highway, heavy-duty, 2 cycle engines | 20 | 40 | n/a | 50 |
| Lubrizol | PuriNOx Water emulsion fuel |
Highway & Non-road, heavy-duty, 2 & 4 cycle | 16 to 58 | -35 to 33 | 9 to 20 | -30 to -120 |
| Paceco Corporation |
MES diesel particulate filter (MES-DPF) | Pre-1996 nonroad, 4-cycle, heavy-duty diesel engines in the 225 - 450 kW (NR7) power range in electrical generation applications | 39 | 90 | n/a | 95 |
| PUREM |
PMF Green-Tec Particulate Filter/Catalyst | Highway, medium-heavy duty up to 280 hp, 4 cycle, non-EGR, model year 1998 - 2003, turbocharged or naturally aspirated engines | 90 | 85 | n/a | 90 |
| PUREM | PMF Green-Tec 230 Particulate Filter/Catalyst | Highway, medium-heavy duty up to 230 hp, 4 cycle, non-EGR, model year 1998 - 2003, turbocharged or naturally aspirated engines | 90 | 80 | n/a | 95 |
| Various | Biodiesel (1 to 100%) | Highway, heavy-duty, 2 & 4 cycle | 0 to 47 | 0 to 47 | -10 to 0 | 0 to 67 |
| Various | Cetane Enhancers | Highway, heavy-duty, 4 cycle, non-EGR-equipped engines | n/a | n/a | 0 to 5 | n/a |
a - Total PM reduction figures reflect reductions from both tailpipe and crankcase emissions.
b - This verification is conditional. Full verification will be achieved upon completion of additional testing and other requirements.
Note: For after-treatment devices the reductions are based on the installation of retrofits to engines that were originally produced without diesel oxidation catalysts or diesel particulate filters.
NO2 Limits
In a December 20, 2007 letter (PDF) (2 pp, 68K, December 2007) EPA announced that increases in nitrogen dioxide (NO2) from diesel retrofits verified through the EPA's National Clean Diesel Campaign would be limited to no more than 20 percent of the baseline engine NO2 levels. This requirement will become effective on Jan. 1, 2009. EPA's NO2 policy was further clarified in a letter (PDF) (2 pp, 129K, September 2008) issued September 24, 2008.
Memorandum of Agreement (MOA) with California Air Resources Board (ARB)
The Environmental Protection Agency's (EPA's) Diesel Retrofit Program signed a Memorandum of Agreement (MOA) (PDF) (3 pp, 204KB, June 2004) with the State of California Air Resources Board (ARB) for the Coordination and Reciprocity in Diesel Retrofit Device Verification. The MOA establishes reciprocity in verifications of hardware or device-based retrofits, and further reinforces EPA's and ARB's commitment to cooperate on the evaluation of retrofit technologies. This agreement commits EPA and ARB to work toward accepting particulate matter (PM) and oxides of nitrogen (NOx) verification levels assigned by the other's verification programs. Additionally, as retrofit manufacturers initiate and conduct in-use testing, EPA and ARB agreed to coordinate this testing so data generated may satisfy the requirements of each program. This MOA is intended to expedite the verification and introduction of innovative emission reduction technologies. Additionally, this MOA should reduce the effort needed for retrofit technology manufacturers to complete verification.
In addition to the above list of EPA verified retrofit technologies, EPA recognizes and accepts those retrofit hardware strategies or device-based systems that have been verified by the California Air Resources Board (CARB). For more information read CARB's Verification Program 
which also has links to their list of verified technologies.