Sea Ray’s SLX 310 OB is designed with a layout that prioritizes comfort and a social seating arrangement. The SLX 310 OB doesn’t just look to entertain with a socially optimized and accommodating layout; it looks to entertain via creation of an environment.
By eliminating the sterndrive engines, which traditionally have powered boats of this size and type, Sea Ray has created more internal space for storage as well as improved performance by moving propulsion aft.
- • Outboard Power. By converting the 310 from a sterndrive to outboard power, the builder is accommodating buyers who prefer outboards. It also opens up storage space where the sterndrive engines would normally go.
- • Digital Throttle Control. Digital Throttle Control comes standard on the SLX 310 OB and delivers smoother shifting, easier docking, more immediate throttle response, and in-depth information displays. Digitizing this process brings greater reliability and responsiveness. Additionally, joystick propulsion -- yet another step in improving predictability and ease of navigation -- comes as an option.
- • Custom Trailer. A trailer comes standard.
- • Five-year Stem-to-Stern Warranty. This is a factory-backed, non-declining program that includes the engine and all components. This is an unusual warranty, heretofore only offered by a few premium builders.
- • Power Tower. The versatility of the SLX 310 OB’s electric tower is a major part of its entertainment-centric design. Easily raised/lowered via an electrically articulating bimini system. This can be further outfitted by an optional fiberglass hardtop.
- • Dynamic Running Surface. The SLX 310 OB utilizes large, triangular planes set into the hull to create an articulated running surface that improves acceleration, reduces bow rise, and keeps the boat at optimal trim, according to the builder. The Dynamic Running Surface system does this automatically. Further, the system allows for recording presets, perfect for calling up an individualized wake for skiers and wakeboarders.
- • Enclosed Head. The SLX 310’s enclosed head is notably spacious -- ample headroom, a granite countertop, sink, mirror, and a porthole -- and helps expand the type of excursions the SLX 310 OB can tackle.
- • Solid Surface Countertop Wet Bar. The SLX 310 OB’s cockpit wet bar has a solid-surface countertop with sink and faucet and the ability to upgrade it with either of a grill or refrigerator with pull-out drawers.
- • Swim Platform. With the aft-facing lounge seating, the SLX 310 OB’s swim platform is a big part of its entertainment profile. It’s a large swim platform, integrated with a manual swim step that blurs the line between water and boat when anchored and relaxing. Optional non-skid pad or teak flooring available as well.
Bow seating lounge. The bow seating lounge on the SLX 310 OB has the familiar touch of being optionally converted to either sunpad with a filler cushion or augmented with a mountable cocktail table. The U-shaped seating section is lined with plush bolsters along the gunwales as well as two forward facing backrests that have armrests at each end. Recessed grab rails and speakers are also in place. The windlass locker is at the peak of the bow.
The bow also has an in-deck storage locker as well, accessed via a small latch on the bow deck.
Sleek, LED-lit dash. The dash on the SLX 310 OB is stylish with LED lighting along the edges of the panels to light up the electronics and gauges in the dark, and an intuitive layout with new twists on familiar readouts. This includes a custom Sea Ray SmartCraft that has glass lenses and chrome bezels. The visor on the dash has leather accents and also holds two cup holders. The helm station has a lockable glove box just below the dash as well.
Dynamic Display. The SLX 310 OB comes standard with the Dynamic Display readout, spread over two Medallion touchscreen displays of 12” and 7”. The Dynamic Display offers connectivity with and control over multiple systems -- navigation, audio, engine, lighting, and many more. Further, the SLX 310 OB comes standard with the Digital Throttle & Shift system, which offers a digitized, reliable response improving shifting, and docking maneuvers.
The dash includes a speedometer, systems tachometer that covers depth, water temperature, engine alarm, fuel consumption and usage readout, trim level, troll control, and digital speed.
Helm seating and day head. The captain’s chair is a double-wide seat with flip-up bolsters and arm rests. The companion seat to port is double-wide as well and also features flip-up bolsters as well as the ability to swivel back toward the cockpit seating section. The companion seat faces a console with a lockable glove box just above the big latch for the day head.
The head has a step-down improving headroom, and the door is lockable. The head has a solid surface countertop, stainless steel sink and faucet, vacu-flush head, portlight, storage, and non-skid floor treatment.
Finally, the helm also has a storage compartment just under its console, accessible from the aft bow cushion on the starboard side, which flips up and offers storage racks and straps, a light, and a door to the backside of the dash instruments.
Cockpit seating space. The cockpit space is largely taken up by the L-shaped dinette, a large, comfortable space that is one of boat’s central features. There seating comes in two places, broken up only for flow from one part of the boat to the next. The larger of the two extends along the transom and then forward along the portside of the boat.
A large table comes standard here and is serviced as such by the wet bar on the starboard side, which has a solid-surface countertop with a full sink and faucet under the liftable countertop.
The wet bar can also be upgraded with either of a grill or refrigerator with drawers.searay_slx310ob_cockpittable_2017.jpgThe cockpit table can be teak, as seen, or simply fiberglass. This is the transom arm of the L-shaped cockpit seating.
The second part of the cockpit seating is smaller, facing aft just up against the back of the captain’s chair and extending just to where the wet bar sits.
Cockpit storage options. The cockpit has storage via side panels, as well as an in-deck locker in between the helm and cockpit sized for wakeboards and skis. This storage compartment lifts with gas-assisted struts on the latch and has vinyl matting as well. The transom walk-through space has a hatch that lifts to access a removal tub.
Aft-facing bench seat and sunpad lounge. Moving from the cockpit to the stern via the starboard side transom walk-through, we reach the aft-facing bench seating looking out over the aft swim platform. The seating is versatile -- it can stretch forward to make a large sunpad lounging space or flip-up to shape itself more into a plush-upholstered bench seating space. Lifting up under the entirety of the seating reveals another large storage space.
The swim platform is larger than many and combines with the aft-facing lounge to create a water-play friendly space when anchored. It has an under-mount ladder and manual swim step. Add the stainless-steel ski-tow, and Dynamic Running Surface preset capability and the SLX 310 OB can easily produce a stable ride with an ideal wake for watersports.
The SLX 310 OB has four different options for propulsion (six when you include color choice), some of which offer the ability to include the joystick docking control. The joystick docking control makes navigation in tight spaces much easier and responsive. Here’s what Sea Ray offers in terms of power options:
- • Twin Mercury 300XL Verado FourStroke Outboards with Joystick Piloting (300-hp)
- • Twin Mercury 300 Verado FourStroke Outboards (STANDARD – 300-hp)
- • Twin Mercury 350XL Verado FourStroke Outboards with Joystick Piloting (350-hp)
- • Twin Mercury 350XL Verado FourStroke Outboards (350-hp)
The Sea Ray SLX 310 OB has a LOA of 31’6” (9.60 m), a beam of 10’2” (3.10 m) and a draft of 32” (81 cm). With an empty weight of 10,335 lbs. (4,688 kg), 41% fuel and two people, we had an estimated test weight of 11,187 lbs. (5,074 kg).
With a pair of 350-hp Mercury Verados turning 19p revolution props, we reached a top speed of 53.4 mph at 5900 rpm. Best economic cruise came in at 4000 rpm and 31.9 mph. At that speed, the 20.1 gph fuel burn translated into 1.6 mpg and a range of 250 statute miles, all while still holding back a 10% reserve of the boat’s 175-gallon (662.4 L) total fuel capacity.
In acceleration tests, the bow comes up 7-degrees before settling in to her 5-degree bow high cruise attitude after reaching planing speed in 4.7 seconds. With the power left at full throttle, we continued accelerating through 20 mph in 7.2 seconds and passed 30 in 10.5 seconds.
Of course we had calm water on our test day so we can’t comment on how she handles chop, but crossing the wake of our camera boat had her pushing through with minimal effect and no pounding whatsoever.
In turn tests, she rolls 17-degrees with the helm hard over. She will throw a wall of water in performance turns as a testament to how well she holds her track, rather than sliding along the turn. She’ll crank around in a little over her length and chine walk is minimal even when maneuvering through self-generated turbulence.
When it came time to head back, we wanted to see how she handles with the Axius joystick. And no surprise, she was dialed in perfectly to the joystick. We noticed a zero lag time between joystick inputs and response, and there was an even balance between the bow and stern with neither one tending to overtake the other.
Options to Consider
- • Fiberglass Hardtop with Lights and Anchor ($6,308)
- • Hardtop with Opening Canvas ($10,000)
- • Hardtop with Extended Sunshade ($14,615)
- • Hardtop Opening Canvas and Extended Sunshade ($18,462)
- • Bow Shade System ($923)
- • Premiere Audio Stereo Upgrade ($2,077)
- • SmartCraft VesselView Display ($1,531)
- • Blue LED Lighting Package ($1,615)
- • Electric Grill ($2,462)
- • Air Compressor for water toy inflation ($231)
- • Bow Ladder with Hatch ($300)
The SLX 310 OB custom trailer comes standard.
Sea Ray offers a five-year factory warranty program, which Sea Ray calls “SURPA5S.” This is five years of bow-to-stern factory warranty for the boat and its components from defects in materials or workmanship. The engine is covered for the same five-year period, using a warranty backed by Mercury and Brunswick product protection. Finally, all Sea Ray sport boats have a limited Lifetime Structural Hull Warranty.
The SLX 310 OB is an entertainment-oriented bowrider, and the outboard model of Sea Ray’s SLX 310 line. There are few differences in size, so a major decision here is between the outboard engines and a sterndrive. Both have their advantages; here is a look at the pro-outboard side of the argument:
- • Outboard motors are easier to access, lower maintenance, easier to winterize, and generally easier to work on when necessary.
- • In the last five years, fiberglass outboard registrations have increased +29.8% while I/O’s have declined 18.2%.*
- • A boat equipped with an outboard is easier to repower or upgrade to more HP or newer technology. To replace an inboard/outboard motor would be much more troublesome.
- • Because the props are farther aft than they would be on a sterndrive, a higher top speed may be possible.
*source: Statistical Surveys, LLC
Most buyers looking for an entertaining boat will find little lacking in design from the SLX 310 OB.
Test Result Highlights
- Top speed for the Sea Ray SLX 310 OB (2017-) is 53.4 mph (85.9 kph), burning 61.4 gallons per hour (gph) or 232.4 liters per hour (lph).
- Best cruise for the Sea Ray SLX 310 OB (2017-) is 23.6 mph (38 kph), and the boat gets 1.4 miles per gallon (mpg) or 0.6 kilometers per liter (kpl), giving the boat a cruising range of 213 miles (342.79 kilometers).
- Tested power is 2 x 350-hp Mercury Verado.
Standard and Optional Features
Full Warranty Information on this brand coming soon!
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