Head to head
Mercedes-Benz S-Class Saloon Long vs Poseidon Blu Water 170
The Mercedes-Benz S-Class Saloon Long is 20cm longer.
Last reviewed 13 September 2026
Key differences
- Length: the Mercedes-Benz S-Class Saloon Long is 20cm longer.
Specifications side by side
| Mercedes-Benz S-Class Saloon Long | Poseidon Blu Water 170 | |
|---|---|---|
| Length | 5,304mm | 5.10m |
| Width | 1,921mm (excl. mirrors) | - |
| Boot capacity | 515-535 litres (combustion engines) | - |
| Seats | 5 | - |
| Engine options | S350d L 4MATIC diesel, S450e L / S580e 4MATIC L plug-in hybrid, S500 L 4MATIC petrol | - |
| Beam | - | 2.17m |
| Weight | - | 500kg |
| Passenger capacity | - | 7 |
| Standard outboard | - | Honda BF50 LRTU (30-80HP range) |
| Fuel tank | - | 60 litre integral tank |
Sources: Mercedes-Benz S-Class Saloon Long, Poseidon Blu Water 170. Figures vary by model year and options, so check with the supplier before you commit.
Buy or hire the S-Class Saloon Long if...
- you want one that is 20cm longer
Mercedes' flagship saloon in long-wheelbase form, the standard car for UK chauffeur firms rather than self-drive hire. The extended wheelbase adds rear legroom rather than luggage space, which stays much the same as the standard car.
Listed by
- Anytime Chauffeurs - London
Buy or hire the Blu Water 170 if...
A compact five-metre day boat aimed at buyers wanting a simple, towable boat for fishing or pottering along the coast. It is sold with a Honda outboard already fitted and can take a bigger engine if more speed is wanted.
Listed by
- Boatsmart - Southampton, Swanwick
Common questions
What is the difference between the Mercedes-Benz S-Class Saloon Long and the Poseidon Blu Water 170?
The Mercedes-Benz S-Class Saloon Long is 20cm longer. The Mercedes-Benz S-Class Saloon Long is a long-wheelbase flagship luxury saloon; the Poseidon Blu Water 170 is a small centre-console day boat for leisure use, fishing or beach hopping.
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