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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 2024 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 11G95ME-C10-GI A 0% 8
2 7G80ME-C9-GI A 1% 10
3 11G95ME-C10 A 1% 5
4 12X92 A 2% 12
5 7G80ME-C9-HPSCR A 3% 10
6 7G80ME-C9.5 25,250 kW A 4% 12
7 7G80ME-C9 62,000 kW A 5% 95
8 6G60ME-C10-LGIP A 5% 6
9 12X92DF 63,840 kW A 5% 15
10 6G70ME-C9.2 21,840 kW A 5% 5
11 8G95ME-C10 A 5% 16
12 7G80ME-C9.2 29,340 kW A 5% 7
13 6G60ME-C10-LGIP-HPSCR A 6% 5
14 7L70ME-C8 22,890 kW A 6% 7
15 11G90ME-C10-GI 68,640 kW A 7% 15
16 5G60ME-C10 A 7% 5
17 9G95ME-C10 61,830 kW A 8% 14
18 8G95ME-C10-LGIM A 8% 6
19 11X92 67,430 kW A 8% 18
20 8G95ME-C10-EGRTC A 9% 5
21 7S65ME-C8 16,040 kW A 9% 8
22 6S60ME-C10-EGRBP A 9% 13
23 11G95ME 75,570 kW A 9% 8
24 8S80ME-C9 67,100 kW A 9% 10
25 7RT-flex84T 29,400 kW A 9% 6
26 7S65ME-C 16,580 kW A 10% 9
27 10S90ME-C10 61,000 kW A 10% 9
28 11S90ME-C10 62,500 kW A 10% 14
29 12S90ME-C10 73,200 kW A 10% 5
30 9L32/40CD 4,500 kW A 10% 5
31 8S80ME-C MK9.2 59,360 kW A 11% 8
32 11G95ME-C9 75,570 kW A 11% 40
33 11S90ME-C10.5 48,900 kW A 12% 5
34 7S90-C9.2 40,670 kW A 12% 5
35 7RTA52 8,952 kW A 12% 19
36 6G70ME-C10 18,360 kW A 13% 33
37 6G70ME-C10.5 A 13% 5
38 6X52 10,860 kW A 13% 15
39 7S80MC 25,480 kW A 13% 12
40 11X92-B A 14% 9
41 10X92 51,600 kW A 14% 11
42 10X92DF 51,680 kW A 14% 10
43 6G70ME-C9 21,840 kW A 15% 153
44 6G50ME-C9-LGIM 7,180 kW A 15% 12
45 9G80ME-C9 36,600 kW A 15% 5
46 6X72 21,660 kW A 16% 17
47 11S90ME-C9.2 59,780 kW A 16% 6
48 11S90ME-C9 63,910 kW A 16% 32
49 6G70ME-C10-HPSCR A 17% 17
50 6G70ME-C9.5 21,840 kW A 17% 10
51 7RT-flex82T 31,640 kW A 17% 12
52 6S70MC 18,558 kW A 18% 47
53 7RT-FLEX58T-D 15,260 kW A 18% 6
54 8G95ME-C9 54,960 kW A 18% 24
55 5G70ME-C9 14,520 kW A 18% 6
56 6S60ME-C8-HPSCR A 19% 5
57 5X72DF 32,250 kW A 19% 94
58 6S70MC-C7 18,660 kW B 21% 17
59 6S70ME-C8 19,620 kW B 22% 10
60 8S60ME-C8 19,040 kW B 23% 13
61 6S70MC-C8 19,620 kW B 23% 31
62 7X82-B 33,250 kW B 23% 5
63 6G60ME-C10 17,040 kW B 23% 23
64 11K98ME 62,920 kW B 23% 5
65 6S70MC-C 18,660 kW B 24% 204
66 12K98ME7 72,240 kW B 24% 10
67 7G50ME-C9 12,040 kW B 24% 8
68 6G50ME-C9-HPSCR B 24% 46
69 6S60ME-C10 14,940 kW B 24% 73
70 HHI MAN B&W; 12K98ME7 68,640 kW B 24% 7
71 9X82 42,750 kW B 24% 6
72 6G80ME-C10 B 25% 7
73 10S90ME-C9 58,100 kW B 25% 13
74 5G70ME-C10-GI B 25% 6
75 12K98MC-C7 72,240 kW B 25% 5
76 6S60ME-C8 (Tier II) 9,932 kW B 26% 18
77 9S90ME-C10 54,900 kW B 26% 30
78 6S60ME-C 12,862 kW B 26% 61
79 6UEC50LSH 6,870 kW B 26% 6
80 8X92 42,350 kW B 26% 6
81 10S90ME-C MK9.2 TIER 2 51,070 kW B 26% 5
82 6X62 16,080 kW B 26% 20
83 6S50MC-B9 7,560 kW B 26% 7
84 6S60ME-C8.5 9,446 kW B 27% 8
85 7S90ME-C9 40,670 kW B 27% 10
86 6S60ME-C10-HPSCR B 27% 16
87 6S60ME-C8.2 10,450 kW B 27% 17
88 DOOSAN-SULZER 14RT-FLEX96C B 27% 8
89 6RTA72 B 27% 8
90 6S60ME-C8 18,660 kW B 27% 228
91 7G80ME-C10-HPSCR B 27% 15
92 14RT-flex96C 80,905 kW B 27% 18
93 12M43C 24,000 kW B 28% 23
94 7S40ME-B9 5,750 kW B 28% 19
95 D2840LE 1,060 kW B 28% 7
96 6G60ME-C9-HPSCR B 28% 13
97 6G60ME-C10-HPSCR B 28% 12
98 7S60ME-C10 B 28% 5
99 6S90MC-C 29,340 kW B 29% 18
100 PE lined pipe B 29% 53
101 6G60ME-C10-GI-HPSCR B 30% 6
102 12K98MC-C 68,520 kW B 30% 84
103 6G50ME-B9.3-LGI (Tier-II) 10,320 kW B 30% 5
104 7K98ME 68,520 kW B 31% 5
105 6G80ME-C10-HPSCR B 31% 6
106 6G50ME-C9-LGIP-HPSCR B 31% 8
107 12K98ME-C 72,079 kW B 31% 24
108 6S50ME-B9.3 10,680 kW B 31% 35
109 6S50ME-C9-HPSCR B 31% 15
110 8S90ME-C10 48,800 kW B 31% 5
111 12 RTA 96 C-B 69,620 kW B 31% 15
112 5G60ME-C9 13,400 kW B 32% 46
113 9L48/60B 21,600 kW B 32% 17
114 12K98ME 68,640 kW B 32% 30
115 6S50ME-C9 7,860 kW B 32% 62
116 6G50ME-C9 17,500 kW B 32% 186
117 6G50ME-C9.6 B 32% 13
118 6S50ME-B9.5 9,000 kW B 33% 8
119 11RT-flex96C 62,920 kW B 33% 13
120 6X62DF 12,540 kW B 33% 26
121 6S80ME-C9 27,060 kW B 33% 16
122 8S60MC 16,320 kW B 33% 7
123 6S60ME 12,240 kW B 33% 5
124 6L21/31 1,290 kW B 33% 12
125 6G60ME-C9.5 (Tier II) 13,500 kW B 34% 7
126 9S50ME-C9 B 34% 11
127 8S60ME-C 19,040 kW B 34% 20
128 GD2 B 34% 980
129 6S50ME-C8.2 9,960 kW B 34% 10
130 5S60ME-C 11,900 kW B 34% 20
131 5S60ME-C8 Tier II 8,300 kW B 34% 15
132 6S50ME-C9-EGRBP B 35% 8
133 6S50ME-B9.2 (Tier II) 10,680 kW B 35% 5
134 6RTA58T-B 12,750 kW B 35% 7
135 6S50MC-C-8 9,960 kW B 35% 8
136 6G45ME-C9-HPSCR B 35% 7
137 5RT-flex58T 10,900 kW B 35% 11
138 6UEC50LSII 8,670 kW B 35% 36
139 12 K98MC 68,666 kW B 35% 38
140 6G60ME-C9.2 16,080 kW B 35% 26
141 9S90ME-C8 47,430 kW B 36% 15
142 9S90ME-C9 52,290 kW B 36% 27
143 5G70ME-C10-GA B 36% 5
144 6UEC50LSH-EcoC2 10,680 kW B 36% 6
145 6G60ME-C9 16,080 kW B 36% 273
146 6S50ME-B9 10,680 kW B 37% 270
147 6S40ME-B 6,810 kW B 37% 14
148 6S60MC 12,530 kW B 37% 139
149 5G70ME-C9-GI 36,400 kW B 37% 30
150 6L23/30 810 kW B 37% 19
151 6G50ME-B9 7,740 kW B 37% 97
152 12K90MC 54,902 kW B 38% 18
153 6S60MC-CMKVII 13,560 kW B 38% 6
154 6EY22AW 1,180 kW B 38% 12
155 6S60MC-C7 15,820 kW B 38% 11
156 6G60ME-C9.5 16,080 kW B 38% 21
157 6S60MC-C8 29,890 kW B 39% 33
158 6S46ME-B8.3 8,280 kW B 39% 11
159 16V32D 5,916 kW B 39% 9
160 Paint B 39% 25
161 9 L 46 C B 39% 6
162 6S46ME-B8.5 8,280 kW B 39% 8
163 8UEC50LSII 11,560 kW B 39% 5
164 AMB B 40% 142
165 8RT-FLEX68D 25,040 kW B 40% 11
166 6S50MC6.1 C 40% 5
167 7UEC60LSII 14,315 kW C 40% 21
168 6S50MC-C8.2 9,480 kW C 41% 7
169 12M43 21,600 kW C 41% 5
170 6RTA58T 12,350 kW C 41% 21
171 8RT FLEX 96C 45,760 kW C 41% 10
172 8L46F 10,000 kW C 41% 13
173 10RT-flex96C 74,677 kW C 41% 20
174 6RT-flex50-B 9,960 kW C 41% 12
175 7X62DF 16,695 kW C 41% 7
176 12RTA96C 65,880 kW C 41% 15
177 10K98ME-C 57,100 kW C 41% 6
178 6G50ME-B9.3 7,860 kW C 41% 18
179 7RTA48T 10,185 kW C 42% 13
180 6G50ME-C9-LGIP C 42% 5
181 7RT-flex50-B 11,620 kW C 42% 8
182 7S50ME-B9 12,460 kW C 42% 10
183 10K98ME 68,520 kW C 42% 7
184 5S60MC 8,990 kW C 42% 33
185 5S60MC-C8 11,300 kW C 42% 26
186 5S60MC-C 11,300 kW C 42% 119
187 6RT-flex50DF C 42% 7
188 6UEC45LSE-Eco-B2 7,470 kW C 43% 13
189 6X72DF 19,350 kW C 43% 11
190 9L32C 4,500 kW C 43% 10
191 10 K 98 MC-C 57,205 kW C 43% 30
192 5S60ME-C8 11,900 kW C 43% 112
193 6S50MC-C8.1 9,960 kW C 43% 7
194 7RTA52U 9,526 kW C 43% 10
195 2x12V50DF / 2x6L50DF 34,200 kW C 44% 11
196 8K98ME 44,900 kW C 44% 5
197 7L27/38 7,350 kW C 44% 14
198 7RTA84C 28,371 kW C 44% 10
199 7UEC60LS C 44% 9
200 7RT-flex60C 16,520 kW C 44% 12