Brand Comparison
Cox Marine vs Mariner Outboards
A straight, factual side-by-side — both are excellent builders that simply shine in different places. Here is how they line up and who each one suits.
| Cox Powertrain Ltd. | Mariner Outboards (Brunswick / Mercury Marine) | |
|---|---|---|
| Founded | Project from 2007–2008; production 2020 | 1970s (Australia early 1970s; U.S. 1976) |
| Headquarters | Shoreham-by-Sea, United Kingdom | Fond du Lac, Wisconsin, USA (via Mercury Marine) |
| Ownership | Privately held (Cox Powertrain) | Brunswick Corporation → Mercury Marine |
| Stock / Ticker | Privately held | Parent: Brunswick Corp (NYSE: BC) |
| Annual Revenue | Not publicly disclosed (private company) | Not separately disclosed (brand folded into Mercury Marine) |
| Employees | Not publicly disclosed | Supported by Mercury Marine |
| Manufacturing | One purpose-built manufacturing facility | Serviced via Mercury Marine |
| HP Range | 300 – 350 hp | Legacy range (supported by Mercury today) |
| Fuel / Power | Diesel (compression-ignition) | 2-stroke & 4-stroke gasoline (legacy) |
| Product Lines | 2 families | 1 families |
| Signature Tech |
|
|
| Famous For | The world's first purpose-built high-power diesel outboard. Cox is famous for the CXO300 — a ground-up V8 diesel aimed at military and commercial operators, not a converted automotive engine. | Being “badge-engineered Mercury.” Mariner is best known as Brunswick's companion brand — Mercury reliability under a different name, still serviceable at Mercury dealers. |
| Best For | Military, commercial and superyacht-tender operators needing a rugged, long-range diesel outboard and single-fuel logistics. | Owners and used-motor buyers of legacy Mariner outboards who want Mercury-network parts and service. |
Revenue and workforce figures are point-in-time snapshots from company filings for the year shown (in several cases the parent company, not just the marine division). Stock price, market value, and ROI change daily — use the ticker for live pricing.
Where Each Brand Dominates
Cox Marine on the water
Military & Commercial
Rugged diesel built for patrol, security and workboat duty with single-fuel logistics.
Long-Range & Efficiency
Diesel economy and torque suit heavy loads and extended range.
Superyacht Tenders
Diesel-tender option matching a mothership's fuel supply.
Mariner on the water
Legacy Support
Mercury Marine still supplies parts and service for many Mariner motors.
Value & Used Market
A budget-friendly used option sharing Mercury components.
Small & Rental Boats
Originally aimed at recreational, rental-fleet and smaller-boat owners.
Which one fits you?
Choose Cox Marine if…
- ✓Purpose-built marine diesel (not an adapted car engine)
- ✓Diesel efficiency and range (claims of ~30% better economy)
- ✓Commercial/military durability and single-fuel logistics
Choose Mariner if…
- ✓Mercury parts and service compatibility for legacy motors
- ✓Simple, proven designs shared with Mercury
- ✓Strong used-market availability
Browse & Official Links
External links open in a new window.
The Honest Take
Both Cox Powertrain Ltd. and Mariner Outboards (Brunswick / Mercury Marine) are top-tier outboard builders — you can buy either with confidence. Cox Marine leans toward military, commercial and superyacht-tender operators needing a rugged, long-range diesel outboard and single-fuel logistics, while Mariner leans toward owners and used-motor buyers of legacy mariner outboards who want mercury-network parts and service. For most buyers the deciding factors are which dealer and service network is strongest in your area, and which brand your local mechanics know best. Whichever you choose, you can browse listings for both on OutboardListings.com.
FAQ
Is Cox Marine or Mariner the better outboard?
Neither is universally "better" — they lead in different areas. Cox Marine is best for military, commercial and superyacht-tender operators needing a rugged, long-range diesel outboard and single-fuel logistics. Mariner is best for owners and used-motor buyers of legacy mariner outboards who want mercury-network parts and service. The right choice depends on how you boat and what dealer support is near you.
What is the HP range of Cox Marine vs Mariner?
Cox Powertrain Ltd. offers 300 – 350 hp, while Mariner Outboards (Brunswick / Mercury Marine) offers Legacy range (supported by Mercury today).
Who owns Cox Marine and Mariner?
Cox Powertrain Ltd.: Privately held (Cox Powertrain). Mariner Outboards (Brunswick / Mercury Marine): Brunswick Corporation → Mercury Marine.