Average Age Of The Vessel By Engine Model (Detroit Diesel, Cummins, & Caterpillar) & Marine Transmission Model (Allison & Twin Disc)

January 8, 2025

Engine Model	Common Applications	Fuel Efficiency(Gallons/Hour)**	Average Vessel Age (Years)
3-53	Small fishing boats, auxiliary power	3–6	40–50
4-53	Small commercial vessels, auxiliary power	4–7	35–45
6V53	Trawlers, small workboats	6–10	30–40
8V53	Trawlers, medium-sized fishing boats	8–12	30–40
2-71	Historic vessels, auxiliary engines	2–5	50–60
3-71	Historic vessels, small fishing boats	3–6	50–60
4-71	Small commercial vessels	4–8	40–50
6-71	Medium-sized commercial vessels	6–10	40–50
6V71	Medium-sized fishing and workboats	6–10	35–45
8V71	Tugboats, medium-sized vessels	8–14	30–40
12V71	Large commercial vessels	12–20	30–40
16V71	Large tugboats, heavy-duty vessels	16–25	25–35
6V92	Medium workboats, fishing vessels	8–14	25–35
8V92	Medium-sized vessels, recreational yachts	12–20	25–35
12V92	Large fishing boats, heavy-duty vessels	18–28	20–30
16V92	Large workboats, industrial vessels	24–35	20–30

Engine Model	Common Applications	Fuel Efficiency(Gallons/Hour)**	Average Vessel Age (Years)
4BTA	Small fishing boats, recreational vessels	4–6	25–35
6BTA	Medium-sized recreational boats	6–9	20–30
QSB	Modern recreational and light commercial	5–8	15–25
6CTA	Medium-sized fishing boats, light workboats	8–12	20–30
QSC	Modern recreational vessels	7–10	15–25
ISL	Medium workboats, light-duty vessels	10–15	10–20
QSL	Recreational and commercial applications	10–14	10–20
M11	Medium commercial vessels	12–18	15–25
ISM	Medium-duty commercial vessels	14–20	10–20
QSM	Recreational yachts, light commercial	15–22	10–20
NT855	Older medium-sized vessels	10–18	30–40
KTA19	Medium fishing boats, tugboats	20–30	25–35
KTA38	Large commercial vessels	30–50	20–30
KTA50	Large tugboats, industrial vessels	50–70	15–25
QSK19	Modern heavy-duty vessels	20–30	10–20

Engine Model	Common Applications	Fuel Efficiency(Gallons/Hour)**	Average Vessel Age (Years)
3116	Small commercial vessels	5–8	20–30
3126	Recreational vessels, light commercial	6–10	15–25
3176	Medium-sized commercial vessels	8–14	15–25
3196	Light commercial vessels	10–16	10–20
3208	Small-to-medium vessels	8–12	25–35
3304	Small fishing boats, auxiliary engines	6–10	30–40
3306	Medium fishing boats, light commercial	8–12	25–35
3406	Medium commercial vessels	12–18	20–30
3408	Medium-duty workboats	16–24	20–30
3412	Heavy-duty industrial vessels	20–35	15–25
3508	Large tugboats, industrial vessels	30–50	10–20
3512	Large commercial vessels	40–60	10–20
3516	Large industrial applications	50–80	10–20
C7	Recreational vessels, light commercial	6–10	10–20
C9	Light commercial vessels	8–14	10–20
C12	Medium-sized recreational/commercial	10–16	10–20
C13	Medium-sized workboats	12–18	10–20
C15	Heavy-duty workboats, industrial vessels	14–22	10–20
C18	Large workboats, industrial vessels	20–30	10–20
C32	Large tugboats, industrial vessels	30–50	10–20

Model	Common Applications	Available Gear Ratios	Average Vessel Age (Years)
MG5050	Small-to-medium vessels	2.0:1, 2.5:1	10–20
MG506	Various marine vessels	1.5:1 to 2.5:1	15–25
MG507	Various marine vessels	1.52:1	20–30
MG509	Various marine vessels	2.0:1	15–25
MG514	Various marine vessels	3.0:1	15–25
MG516	Towing vessels, heavy workboats	3.0:1 to 4.5:1	20–30
MG518	Towing vessels, heavy workboats	6.0:1 to 8.0:1	20–30
MG521	Offshore vessels, fishing boats	4.5:1 to 7.5:1	15–25
MG527	Offshore vessels, fishing boats	5.0:1 to 7.5:1	15–25
MG5301	Tugboats, offshore supply vessels	5.5:1 to 8.0:1	20–30

Model	Common Applications	Available Gear Ratios	Average Vessel Age (Years)
M10	Various marine vessels	1.5:1 to 3.0:1	30–40
M15	Various marine vessels	1.5:1 to 3.0:1	30–40
M20	Various marine vessels	1.5:1 to 3.0:1	30–40
MH15	Various marine vessels	1.5:1 to 3.0:1	20–30
MH20	Various marine vessels	1.5:1 to 3.0:1	20–30
MH25	Various marine vessels	1.5:1 to 3.0:1	20–30
MH30	Various marine vessels	1.5:1 to 3.0:1	20–30
MH37	Various marine vessels	1.5:1 to 3.0:1	20–30
MH45	Various marine vessels	1.5:1 to 3.0:1	20–30

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