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Most Emission-Friendly Marine Engines

Main-engine models ranked by the measured CO2 efficiency of the vessels that carry them (EU MRV 2025 reporting, 200 models with ≥5 reporting vessels).

2025 2024
How this ranking works: every EU-MRV-reporting vessel is scored by its carbon intensity (AER, g CO2 per dwt-nautical-mile) relative to other ships of its type — so tanker engines aren't compared against container-ship engines. An engine model's fleet score is the average efficiency percentile of the vessels carrying it (0% = greenest fleet). Median AER is the absolute intensity. Only main engines with at least 5 MRV-reporting vessels are ranked. Most large two-strokes are built under license — class registers record the licensee (Hyundai, Mitsui, Doosan, …), so identical designs are merged under their design brand (MAN B&W, WinGD, Wärtsilä, …) with the actual builders listed underneath. D/E fleet counts vessels on the design currently at CII band D or E; top retrofit is the most common eligible engine-family measure for those vessels. Retrofit eligibility depends on class equipment records, which do not cover every vessel equally — treat these two columns as indicative, not exhaustive.
# Engine model Grade Fleet score Vessels
1 8G95ME-C10-GI-coEGR A 0% 6
2 7G80ME-C9-GI A 1% 8
3 7L70ME-C8 22,890 kW A 2% 6
4 7X82 24,000 kW A 3% 8
5 7G80ME-C9-HPSCR A 3% 8
6 8G95ME-C10-GI A 3% 10
7 11G95ME-C10 A 3% 5
8 7G80ME-C9.5 25,250 kW A 3% 11
9 7G80ME-C9.2 29,340 kW A 4% 6
10 9X92DF A 4% 8
11 12X92DF 63,840 kW A 5% 15
12 11G95ME-C10-GI A 5% 12
13 8G95ME-C10-LGIM A 5% 15
14 6G60ME-C10-LGIP A 5% 10
15 7G80ME-C9 62,000 kW A 5% 70
16 9G95ME-C10-GI A 5% 10
17 12X92 A 5% 12
18 6S70MC6 16,860 kW A 6% 10
19 7S65ME-C 16,580 kW A 7% 10
20 7RTA52 8,952 kW A 8% 21
21 7S65ME-C8.5 20,090 kW A 8% 5
22 8G95ME-C10 A 8% 17
23 11G90ME-C10-GI 68,640 kW A 8% 19
24 5G60ME-C10 A 9% 7
25 11G90ME-C10 68,640 kW A 9% 6
26 7S65ME-C8 16,040 kW A 10% 6
27 6G90ME-C10-GI A 10% 8
28 9G95ME-C10 61,830 kW A 11% 14
29 6X52 10,860 kW A 11% 21
30 6G60ME-C10-LGIP-HPSCR A 11% 9
31 8S80ME-C9 67,100 kW A 12% 9
32 11X92 67,430 kW A 12% 18
33 10X92DF 51,680 kW A 12% 9
34 8S80ME-C MK9.2 59,360 kW A 13% 8
35 6S60ME-C10-EGRBP A 13% 15
36 8G95ME-C10-EGRTC A 13% 5
37 7S90-C9.2 40,670 kW A 13% 5
38 9L32/40CD 4,500 kW A 14% 5
39 7G80ME-C10-coEGR A 14% 8
40 7S80MC 25,480 kW A 14% 5
41 11G95ME-C9 75,570 kW A 15% 37
42 6S70MC 18,558 kW A 15% 50
43 6X72 21,660 kW A 16% 17
44 12S90ME-C10 73,200 kW A 16% 5
45 11X92-B A 16% 10
46 6G70ME-C9.5 21,840 kW A 16% 9
47 6G70ME-C9 21,840 kW A 17% 138
48 11G95ME 75,570 kW A 17% 8
49 11S90ME-C9 63,910 kW A 17% 48
50 11S90ME-C10 62,500 kW A 18% 19
51 6G70ME-C10 18,360 kW A 18% 48
52 6S90MC-C 29,340 kW A 18% 16
53 11S90ME-C9.2 59,780 kW A 18% 7
54 5G70ME-C9 14,520 kW A 19% 7
55 6S70MC-C8.1 12,240 kW A 19% 5
56 10X92 51,600 kW A 19% 11
57 6UEC50LSH-EcoC2 10,680 kW A 19% 6
58 8G95ME-C9 54,960 kW A 20% 27
59 7RT-flex50-B 11,620 kW B 21% 6
60 10S90ME-C10 61,000 kW B 21% 10
61 6S70ME-C8 19,620 kW B 21% 11
62 6G70ME-C10-HPSCR B 21% 16
63 6G50ME-C9-LGIM 7,180 kW B 22% 18
64 6S70MC-C 18,660 kW B 22% 190
65 D13MG 588 kW B 23% 8
66 5X72DF 32,250 kW B 23% 105
67 8S60ME-C8 19,040 kW B 23% 14
68 7G50ME-C9 12,040 kW B 23% 9
69 9G80ME-C9 36,600 kW B 23% 8
70 8X92 42,350 kW B 23% 6
71 9L32C 4,500 kW B 24% 10
72 6X62 16,080 kW B 24% 17
73 6S70MC-C8 19,620 kW B 25% 28
74 6S40ME-B 6,810 kW B 25% 12
75 6S60ME-C8 (Tier II) 9,960 kW B 25% 22
76 6S60ME-C 14,280 kW B 25% 68
77 10S90ME-C9 58,100 kW B 26% 22
78 6G50ME-C9.6 B 26% 11
79 6G50ME-C9-HPSCR B 26% 53
80 6S70MC-C7 18,660 kW B 26% 15
81 11K98ME 62,920 kW B 27% 5
82 6S60ME-C8.5 9,446 kW B 27% 9
83 DOOSAN-SULZER 14RT-FLEX96C B 27% 8
84 6G60ME-C10 17,040 kW B 27% 55
85 6S60ME-C8.2 10,450 kW B 27% 16
86 12V32/44CR 6,720 kW B 27% 6
87 5G70ME-C10-GA-EGRBP B 27% 13
88 9S90ME-C10 54,900 kW B 27% 32
89 9X82 42,750 kW B 28% 8
90 6S60ME-C8 18,660 kW B 28% 244
91 STX-MAN 5S50MC-C 7,900 kW B 28% 5
92 6L21/31 1,290 kW B 28% 11
93 6S60ME-C10-HPSCR B 28% 13
94 6G50ME-B9.3 7,860 kW B 28% 21
95 PE lined pipe B 28% 50
96 9L48/60B 21,600 kW B 28% 16
97 G8300ZC 4,000 kW B 29% 6
98 7RT-FLEX58T-D 15,260 kW B 29% 5
99 7S90ME-C9 40,670 kW B 29% 9
100 C25:33L8P 4,640 kW B 29% 8
101 14RT-flex96C 80,905 kW B 29% 14
102 6S60ME-C10 14,940 kW B 29% 95
103 6G50ME-C9 17,500 kW B 29% 242
104 6UEC50LSII 8,670 kW B 29% 30
105 12M43C 24,000 kW B 29% 24
106 5G60ME-C9 13,400 kW B 29% 44
107 10S90ME-C9.2 B 29% 5
108 6UEC50LSH 6,870 kW B 30% 6
109 7S40ME-B9 5,750 kW B 30% 19
110 6G80ME-C10 B 30% 7
111 6S60ME-C10-GL-coEGR B 30% 5
112 6RTA58T-B 12,750 kW B 30% 5
113 6G60ME-C9-HPSCR B 30% 11
114 12K98ME-C 72,079 kW B 30% 33
115 7S60ME-C10 B 30% 16
116 7G80ME-C10-GI-ERGTC B 31% 8
117 6G50ME-C9-LGIP-HPSCR B 31% 8
118 HHI MAN B&W; 12K98ME7 68,640 kW B 31% 6
119 5G70ME-C10-GA B 31% 13
120 6G60ME-C10-GI-HPSCR B 31% 5
121 8S60MC 16,320 kW B 32% 6
122 6L46F 7,200 kW B 32% 10
123 6S50ME-C9-HPSCR B 32% 13
124 5G70ME-C10-GI B 33% 9
125 6RTA72 B 33% 6
126 12K98MC-C 68,520 kW B 33% 79
127 5X72 14,320 kW B 33% 7
128 12K98ME7 72,240 kW B 33% 12
129 7G80ME-C10-HPSCR B 33% 16
130 6S50ME-C9-EGRBP B 33% 7
131 12K98ME 68,640 kW B 34% 26
132 11RT-flex96C 68,640 kW B 34% 13
133 7RT-flex50 11,640 kW B 34% 21
134 6S50ME-C9 7,860 kW B 34% 84
135 6S50MC-C-8 9,960 kW B 34% 7
136 6S60MC-C7 15,820 kW B 34% 7
137 6S70ME-C8.2 14,270 kW B 34% 5
138 12 RTA 96 C-B 69,620 kW B 34% 14
139 6S50MC-B9 7,560 kW B 35% 13
140 GD2 B 35% 998
141 9S50ME-C9 B 35% 13
142 7S60ME-C10-GI B 35% 21
143 8V31DF B 35% 5
144 8S90ME-C10 48,800 kW B 36% 5
145 5G70ME-C9-GI 36,400 kW B 36% 51
146 5S60MC-C8 11,300 kW B 36% 24
147 5S60MC 8,990 kW B 36% 38
148 12M43 21,600 kW B 36% 6
149 7RTA52U 9,526 kW B 36% 10
150 6S60MC 12,530 kW B 36% 123
151 6L23/30 810 kW B 36% 19
152 6G50ME-B9 7,740 kW B 36% 97
153 6VDS48/42AL-2 B 36% 7
154 9 L 46 C B 36% 5
155 5S60ME-C 11,900 kW B 36% 15
156 6G60ME-C9.5 (Tier II) 13,500 kW B 36% 7
157 6G60ME-C9 16,080 kW B 37% 270
158 6S46ME-B8.3 8,280 kW B 37% 15
159 6S50ME-B9.3 10,680 kW B 37% 27
160 6G60ME-C9.2 16,080 kW B 37% 26
161 6EY22AW 1,180 kW B 37% 10
162 6X62DF 12,540 kW B 37% 23
163 9K98ME7 56,070 kW B 37% 5
164 6G60ME-C10-HPSCR B 37% 15
165 MAN 9S90ME-C MK8 B 38% 5
166 9H25/33P 2,620 kW B 38% 6
167 5RT-flex58T 10,900 kW B 38% 18
168 MAN-B&W 8,450 kW B 38% 5
169 6S50ME-B9 10,680 kW B 39% 263
170 6S60ME-C9 16,080 kW B 40% 5
171 8UEC50LSII 11,560 kW B 40% 6
172 8S60ME-C 19,040 kW B 40% 20
173 12 K98MC 68,666 kW C 40% 37
174 6G60ME-C9.5 16,080 kW C 40% 17
175 9S90ME-C9 52,290 kW C 40% 27
176 5G45ME-C9 6,950 kW C 40% 22
177 12RTA96C 65,880 kW C 41% 14
178 8UEC60LS 13,753 kW C 41% 17
179 6S80ME-C9 27,060 kW C 41% 14
180 6S50MC-C8.1 9,960 kW C 41% 5
181 6S50ME-C8.2 9,960 kW C 41% 9
182 6S50ME-B9.5 9,000 kW C 41% 5
183 5S60MC-C 11,300 kW C 41% 114
184 D2840LE 1,060 kW C 41% 9
185 6UEC52LA C 41% 122
186 9S90ME-C8 47,430 kW C 42% 16
187 12RT-flex96C 68,640 kW C 42% 22
188 AMB C 42% 117
189 6S60MC-C8 29,890 kW C 42% 32
190 7UEC60LSII 14,315 kW C 42% 26
191 7S50ME-B9 12,460 kW C 43% 6
192 6UEC45LSE 6,840 kW C 43% 87
193 8L46F 10,000 kW C 43% 14
194 10RT-flex96C 74,677 kW C 43% 16
195 Paint C 43% 27
196 Compressors C 43% 399
197 10K98ME 68,520 kW C 44% 5
198 DI16 55M C 44% 10
199 6S50ME-B8 9,960 kW C 44% 23
200 3516C 3,728 kW C 44% 9