Retrofit Technologies

Note: The following content has been reproduced and adapted for the convenience of Canadian SmartWay audiences with permission of the US Environmental Protection Agency (EPA).  To view the original content at the source, please go to EPA - SmartWay Technology Program web site.

It is important to note that some fuel saving technologies listed on these pages do not comply with Canadian regulations. Always consult with provincial/territorial authorities before purchasing.

Natural Resources Canada endeavors to ensure our content is up to date, however if you notice any errors in the information below, please notify us at NRCan.SmartWay.RNCan@canada.ca.

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.

Emission Reduction Performance
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) 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 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 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 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
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 CEMTM Catalytic Exhaust Muffler and/or DCCTM 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 CEMTM Catalytic Exhaust Muffler and/or DCCTM 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 CEMTM Catalytic Exhaust Muffler and/or DCCTM 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 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.