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Sea Ray 300 SLX (2013-)
(w/ 1 x 380-hp MerCruiser 8.2 MAG)

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Brief Summary

The Sea Ray 300 SLX is the largest bowrider in the lineup and provides more room for a crowd to grill, relax, cruise and dine all while being surrounded in a luxurious interior. The SLX models can be thought of as "Select Extreme” packages as they offer first-class options such as two-tone vinyl and built-in cockpit grill to increase the level of comfort in an already high class model. That makes this 300 SLX well deserving of the bragging rights she brings with ownership.

Key Features

  • MerCruiser 8.2 MAG ECT Bravo IIIx with Digital Throttle & Shift or twin engine upgrade optional
  • Standard SmartCraft diagnostics with glass lenses
  • Axius Propulsion System with joystick control optional
  • Garmin GPSMap 640 chartplotter is standard
  • Fiberglass and tubular aluminum sport spoiler
  • Integral swim platform with concealed stainless-steel swim ladder and optional extended swim platform
  • Sony 12V AM/FM/CD stereo with amplifier, six speakers, digital cockpit remote control, and iPod connector
  • Engine hatch with electric lifting system
  • Floor storage with lighting and diamond-plate flooring
  • Lockable enclosed head area with molded fiberglass liner, sink with pullout sprayer, and mirror
  • VacuFlush head system
  • Standard cockpit/tonneau cover
  • Specifications

    Length Overall 29' 6''
    8.99 m
    Beam 9' 8''
    2.95 m
    Dry Weight 7,700 lbs.
    3,493 kg
    Tested Weight N/A
    Draft 38''
    96 cm
    - Draft Up N/A
    - Draft Down N/A
    - Air Draft N/A
    Deadrise/Transom 21 deg.
    Max Headroom open
    Bridge Clearance N/A
    Weight Capacity N/A
    Person Capacity N/A
    Fuel Capacity 130 gal.
    492 L
    Water Capacity 24 gal.
    90 L
    Length on Trailer N/A
    Height on Trailer N/A
    Trailer Weight N/A
    Total Weight
    (Trailer, Boat, & Engine)

    Prices, features, designs, and equipment are subject to change. Please see your local dealer or visit the builder's website for the latest information available on this boat model.

    Engine Options

    Std. Power 1 x 380-hp MerCruiser 8.2 MAG ECT
    Tested Power 1 x 380-hp MerCruiser 8.2 MAG
    Opt. Power 2 x 260-hp MerCruiser 5.0 MPI ECT Bravo I
    2 x 300-hp MerCruiser 350 MAG ECT Bravo I with DTS
    2 x 300-hp MerCruiser 350 MAG ECT SeaCore Bravo I w/ DTS
    2 x 300-hp MerCruiser 350 MAG ECT Bravo III with Axius
    2 x 300-hp MerCruiser 350 MAG ECT SeaCore Bravo III w/ Axius

    Test Results - Change Measurement Unit

    RPM MPH Knots GPH MPG NMPG Stat. Mile NM dBa
    650 3.8 3.3 1.3 3.0 2.7 356 309 66
    1000 6.1 5.3 2.0 3.0 2.6 354 308 68
    1500 8.4 7.3 3.5 2.4 2.1 279 243 71
    2000 9.8 8.5 6.1 1.6 1.4 190 165 74
    2500 16.4 14.3 8.7 1.9 1.6 221 192 77
    3000 26.1 22.7 11.0 2.4 2.1 279 243 77
    3500 32.3 28.1 14.6 2.2 1.9 260 226 78
    4000 38.6 33.5 19.6 2.0 1.7 230 200 79
    4500 44.3 38.5 26.3 1.7 1.5 197 172 81
    4750 46.8 40.7 31.8 1.5 1.3 172 150 81
    650 309 573 6.10 4.73 1.29 66
    1000 308 570 9.80 7.57 1.29 68
    1500 243 449 13.50 13.25 1.02 71
    2000 165 306 15.80 22.90 0.69 74
    2500 192 356 26.40 32.93 0.80 77
    3000 243 449 42.00 41.45 1.01 77
    3500 226 418 52.00 55.08 0.94 78
    4000 200 370 62.10 74.19 0.84 79
    4500 172 317 71.30 99.37 0.72 81
    4750 150 277 75.30 120.19 0.62 81

    All fuel consumption numbers are the total for all engines in the boat. Speeds are measured with Stalker ProSports radar gun or GPS. Fuel consumption (gallons per hour) measured with Floscan digital fuel-flow meter or by on-board factory-installed diagnostic instruments. Range is based on 90% of published fuel capacity. Sound levels determined using Radio Shack digital decibel meter on A scale. 68 dBA is the level of normal conversation. Time to plane is measured from start of acceleration to formation of rooster tail behind boat.

    Performance Chart

    Performance Chart

    Acceleration Times & Test Conditions

    Time To Plane 5.5 sec.
    0 to 30 11.0 sec.
    Ratio N/A
    Props N/A
    Load 3 persons, 1/3 fuel, 0 water, minimal gear
    Climate 91 deg., 72 humid.; wind: 3-7 mph; seas: light chop

    Sea Ray 300 SLX (2013-) Line Drawing


    Captain's Report

    Mission Statement

    Sea Ray created the SLX series to offer added upscale features to a select segment of their boats. The 300 SLX is the largest of that series and it’s loaded with premium features that should appeal to people who like all of the bells and whistles and a bit classier feel. Because of her size, she also handles crowds well and her handling makes her a versatile watersports platform.

    Sea Ray 300 SLX
    The 300 SLX is definitely not short on looks. The standard arch only adds to the racy look in my opinion.

    Distinguishing Features

    "Spoiler" Fiberglass Arch.

    We normally call this a radar arch or towing tower, but since Sea Ray has their own design that has an integral Bimini top that can be used for towing, the builder calls this a "spoiler." No matter what it is called it is usually an option. We think Sea Ray has done a fine job of making this arch look cool. •

    Axius Joystick Drive Available.

    Joystick functionality at the dock when opting for a twin-engine package. •

    Garmin GPS Map 640 Chartplotter.

    This is standard on the 300 SLX where typically any GPS is an option.•

    MerCruiser 8.2 MAG ECT.

    This 380-hp engine with Bravo III and Digital Throttle and Shift is standard. Optional twin-engine upgrade available.•

    SmartCraft Diagnostics.

    System standard. •

    SmartCraft Vessel View Display.

    Available with twin gasoline engine applications.

    Sea Ray 300 SLX
    A filler cushion permits a 7' wide sun pad, but this is only the beginning of what Sea Ray has in store on the 300 SLX. The extended swim platform and teak decks are optional.

    VacuFlush Toilet.

    The toilet also has a 20-gal. holding tank, as well as a vanity with sink, faucet and pullout shower sprayer.•

    Aerodynamic Bimini.

    This design reduces drag and completely eliminates any Bimini vibration or rattling while underway. A cockpit cover, storage bag and Tonneau cover are also standard.•

    Electric Life Engine Hatch.

    This is helpful to have and are often optional.•

    Automatic Fire Suppression System.

    It also has a manual pull. •

    6 10" Mooring Cleats.

    Not 4 but 6, not 6" or 8", but 10". •

    Center Transom Walkthrough.

    Most sportboats have a walkthrough to the cockpit on the starboard or port side. The 300 SLX goes down the middle and I think it looks cool and slightly retro.•

    Dual-Use Aft-Forward Facing Lounge Seat.

    Most boats these days have dual or triple-use aft seats on the larger sportboats, but none that we know of have done it quite the way as we found it on the 300 SLX. It is comfortable, large, and easy to arrange. •

    Quiet Ride Technology.

    This is not a sales gimmick. We measured significantly lower noise levels from best cruise to WOT. See below.

    Sea Ray 300 SLX
    Thanks to the boat's 9'8" beam there is plenty of room in the head compartment for changing.

    Standard Features We Like to See

    The Sea Ray 300 SLX has a number of other items that we often see on the options list of some other builders and we are glad to see them included in the 300 SLX package. They are--• Snap-in carpet• Cockpit table (the forward table is optional)• Dual battery crossover switch• Integral arm rests• Wet bar with solid surface counter top, ss sink and faucet• Gel coating engine room• High water alarm

    Options We Would Order

    For people planning to use the boat for towing, I would suggest the optional extended swim platform. It is really not needed for just cruising and using the boat as a swim platform. As regular readers know we like colored hulls, and so I recommend the two tone pattern and a choice of four colors. For people keeping their boats in salt water, I would also suggest the OceanX anti-corrosion system on the lower unit. There are many more options available than these, just visit the builder's website. With them, buyers can customize the boat to any one of several missions.

    Sea Ray 300 SLX
    Note the treatment for the anchor. The windlass is optional. Both seat bottoms pop up for general storage.

    Comparison With Other Boats in Class

    When we compare the 300 SLX with other boats in class we see that 30' (9.14 m) is the size and weight where builders begin putting twin engines in the boats. In fact, most boats that we looked at in class have twin engines. It is here that the added weight of the second engine and lower unit -- which is typically slightly over 1,000 lbs (454 kgs.) -- offsets to a large degree the extra horsepower contributed by the second engine.


    When we look at top speeds we see that some of the 300-hp twin-powered boats do go as much as 8 mph faster, but some twins go about the same at WOT. So a twin-engine rig is not necessarily a slam dunk for speedsters. The correct prop geometry and overall boat set-up are also important in overcoming the weight penalty imposed by the second propulsion system.

    Best Cruise.

    At cruise speed there seems to be no contest. While the 300 SLX goes from 2-4-mph slower at best cruise, its fuel consumption is from 4 to 6 gallons (15 to 22 L) per hour giving it the best mpg and greatest range of any of the twin-powered boats in class that we looked at. What exactly were the 300's performance numbers? Take a look--

    Sea Ray 300 SLX
    With a single 8.3 L MerCruiser with Bravo III drive the 300 SLX scoots. The beautiful blue and white hull should turn heads everywhere.


    The Sea Ray 300 SLX has a LOA of 29'6" (8.99 m), a beam of 9'8" (2.95 m) and a draft of 38'' (96.5 cm). With an empty weight of 7,700 lbs. (3493 kgs.) 43 gallons (162.8 L) of fuel and two people onboard we had a test weight of 8,377 lbs. (3,800 kgs.).With the 380-hp MerCruiser 8.2 MAG turning a Bravo III outdrive with dual props we reached a top speed at 4750 rpm of 46.8 mph. At that speed fuel burn was 31.75 GPH giving us a range of 172 miles.

    Best Cruise.

    Best cruise came in at 3000 rpm and 26.1 mph. That reduced the fuel burn to just under 11 gph, which the 300 SLX could maintain for 10 hours and 42 minutes and 279 miles while still maintaining a 10% reserve. We had a time to plane of 5.5 seconds and reached 30 mph and 11 seconds.


    When accelerating the 300 SLX, the bow comes up 12-degrees and then comes down 5.5 seconds later. This produces no loss of visibility to the horizon. I found the 300 SLX sensitive to trim and it doesn't take a lot to get her into her cruise attitude. Just bring the trim up a couple of shots and that will be all it takes to move the spray from the helm to the stern quarters and generate the accompanying boost in speed. Adding more trim will ventilate the propellers. It's also important to bring the trim down before beginning any maneuvers.

    Sea Ray 300 SLX
    She comes around gracefully in the turns and her bank angle keeps everyone nicely planted in their seats.

    She's responsive to the helm and I found the 300 to provide an interesting combination of sportboat handling while maintaining a solid feel to the ride. I didn't find slipping or jumping on the turns, but rather she remained smooth and comfortable throughout. It's easy to see the advantages of a boat this size when switching between entertaining and watersports modes -- she can do both with agility.

    Sea Ray 300 SLX
    This is her 20-degree turning angle as seen from inside the boat.

    Features Walkthrough

    Swim Platform

    Our test boat had the optional extended swim platform ($3,077) that added 2’ 8” (.81 m) to the length overall and it measures 6'5" (1.95 m) wide. A three-step reboarding ladder to the port side.

    Sea Ray 300 SLX
    With the extended swim platform, the ladder is moved aft creating two storage compartments in the platform integral to the hull.
    Sea Ray 300 SLX
    To the port side of the transom Sea Ray mounted the optional stereo remote and standard transom shower.

    A molded-in swim platform comes out 1’9” (.53 m) from the transom and has two insulated self-draining storage compartments to either side. There's an optional stereo remote ($308) at the transom as well as a standard transom shower.

    Sea Ray 300 SLX
    The extended swim platform makes a nice addition to the watersports activity functionality.


    Access to the cockpit is via a centerline walkthrough with two sun pads to either side. The starboard sun pad opens to reveal a flip out filler cushion that occupies the center walkthrough and turns the entire aft area into a sun pad measuring 7’ (2.1 m) wide. Additionally, there is a storage compartment under each of the sun pads that are self draining and both are supported by dual gas struts and very beefy 14” (35.6 cm) stainless steel hinges. The hatches are held in the closed position by magnetic catches. They make good places to put wet swimsuits and life vests as the heat from the engine will quickly dry them out.

    Sea Ray 300 SLX
    A walkthrough to the cockpit is exposed by removing the seat cushion and seatback.
    Sea Ray 300 SLX
    With the filler cushions in place five across seating is created. Notice the side mount base on the center line for the standard pedestal table.

    Entering the cockpit by the centerline walkthrough leads to steps created by removing a filler cushion for both the aft bench seat base and seatback. Leaving the filler cushions removed leaves two double-wide seats to port and starboard measuring 36” (99 cm) wide with handles at the bottom. Lifting those handles elevates the forward facing seat to convert them into aft facing loungers that work in conjunction with the two sun pad cushions. There is a flip-out arm that will hold the seats in the open position for use as a lounge. Additionally, there is access to the storage area just ahead of the engine compartment by lifting the seats. In this way two independent lounge seats can be created, much like we see on a beach. By inserting the filler cushion a sun pad is created. All in all it's a clever setup that Sea Ray has engineered well.

    Sea Ray 300 SLX
    Just grab the stainless handle and lift to convert the aft seats into aft facing chaise lounges.
    Sea Ray 300 SLX
    A flip out filler cushion creates a full beam sun pad.


    The cockpit has plenty of seating starting with the aft bench seats that hold five across (with the filler cushions in place), front and back seating to the port side and a double wide seat to starboard facing the center of the cockpit. An over wide seat faces the helm. This is an optional seating arrangement called Archibald Nolan seating. The standard seating arrangement replaces the starboard seat with a wet bar, which seems much more practical for a boat that holds so many people. The wet bar includes a solid surface countertop with a stainless steel sink, a grab handle, trash receptacle, and a storage area below.

    Sea Ray 300 SLX
    Underneath the hatch to the sole storage are line hangers. The opening to the compartment is guttered with the drain leading overboard.

    There is sole storage in between the two seats that is wide but not very long. The caprails on top of the cockpit measures 6” (15.2 cm) wide and are treated with nonskid.

    Sea Ray 300 SLX
    This double wide seat is offered as an option to replace the standard wet bar that would normally be mounted in this position.

    "Spoiler" Arch

    The standard arch is constructed of fiberglass with cast aluminum supports and Bimini top extending both fore and aft. The tow point is 6'8" off the deck. There are LED lights underneath. The Bimini top is designed much like an airplane wing in that it is curved at the top. Sea Ray tells us that this reduces drag. My experience testing Sea Ray boats with this design shows that they remain stable and solid throughout all maneuvers and vibration and rattling is completely eliminated. If it happens to the aerodynamic as well, so be it.

    Clever Portside Seat

    The port side back-to-back seats are an old concept but Sea Ray has a completely new take on the subject. Instead of just collapsing down to form a sun pad the back can be shifted all the way forward or back. There is a credit card-size handle that, when lifted, allows the seat back to slide. Its back rest moves on a metal track with ball bearings and slides easily with one hand. To the portside bulwarks there is storage with a shelf taking up the center of the storage thereby doubling the storage space. Aft of the seating arrangement there is a hatch in the port side bulwarks concealing the battery switch.

    Sea Ray 300 SLX
    The back-to-back seating to port is well padded for comfort. Notice the handle in the middle of the shared seatback.
    Sea Ray 300 SLX
    Simply lift the handle in the center of the seatback and slide forward or aft to create a chaise lounge facing in either direction. Storage is just behind the seat and this is also the location of the battery switch.


    The helm is orderly with six gauges, one being a standard SmartCraft gauge, all showing analog displays but connected to digital wiring and senders. There is a sizable area before the panel allowing storage for small items such as sun tan lotion and sunglasses. All of the rocker switches are protected at the sides from accidental activation and they are lighted at the ends to show when activated. A Garmin GPS Map 640 is included as standard equipment. Additional SmartCraft gauges can be added as desired ($1,531 ea.)

    Sea Ray 300 SLX
    The helm is nicely laid out with brown tones that eliminate any glare. Notice the switch guards and the leather three-spoke wheel.

    Standard equipment is the Mercury DTS or Digital Throttle and Shift System which has a keyless ignition. The leather wrapped steering wheel is mounted to a tilt base and the stereo remote is over to the port hand side of the helm. There is storage both under the helm seat and to the starboard side of the helm.

    Sea Ray 300 SLX
    The GPS chartplotter is standard and notice the SmartCraft gauge just to the right.
    Sea Ray 300 SLX
    The helm seat is extra wide and includes a flip-up bolster. A storage compartment is underneath.

    Port Console

    To the port side is a head compartment that also can function as a changing room as it is so large (remember the beam is 9'8"/ 2.94 m wide). There is an opening portlight and plenty of storage, in addition to a pullout sprayer. The VacuFlush head with a 20 gallon (75.7 L) holding tank is standard. There is an option for a macerator ($915) but check local regulations, and then stick with the holding tank anyway.

    Bow Walkthrough

    The bow walkthrough measures 22” (55.9 cm) wide and the opening windshield is 27” (68.6 cm) wide. It is held in the open position by a positive latch mechanism. There is an air dam that is flush mounted to the starboard bulkhead and when the air dam is opened a secondary door is revealed allowing access to the starboard console.


    Bow seating is quite comfortable with contoured armrests leading to stainless steel grab handles. The seating starts at 17” (43.2 cm) wide and increases to 23” (50.4 cm) wide and the portside seatback opens up from the bottom and lifts upward to reveal storage to the area just ahead of the head. There is dedicated storage for both the standard side mount cockpit table and the optional bow table.

    Sea Ray 300 SLX
    Bow seating is massive and notice how the space between the seats gets wider as we move forward.
    Sea Ray 300 SLX
    Storage is under the seats, as well as under the seatbacks. This portside access is a rarity on a boat that has a head compartment in the port console.

    There is storage under both port and starboard seats and the cushions are hinged from the back so they lift from the forward and a cooler is in the center, fully forward under the forward cushion. At the foredeck there is a self draining anchor locker but there is no anchor keeper.

    Sea Ray 300 SLX
    A self-draining cooler is under the forward seat.

    Engine Compartment

    The five-across seating and sun pads all lift by way of an electrically actuated ram to gain access to the engine compartment. There is plenty of storage ahead of the engine, for tools and the like, and this storage area is also accessed by lifting up the seat cushions. I'd like to see the opening to the engine compartment be increased as the hatch only comes up 17” (43.2 cm), so to do any engine checks you've got to crawl through that narrow opening.

    Sea Ray 300 SLX
    In the full up position, there is still limited access to the engine compartment. Forward there is plenty of storage space.
    Sea Ray 300 SLX
    The single engine installation clearly offers plenty of space to both sides, and enough room for a twin-engine installation.
    Sea Ray 300 SLX
    Engine vents to the side of the boat are quite large at nearly 4’ (1.2 m) in length, and are more of a design feature rather than an engine-breathing necessity.

    A fixed, automatic firefighting system is standard. There are also definite examples of the noise suppression devices used in the Quiet Ride Technology. Let's talk about that.

    Quiet Ride Technology

    Our tests recorded a reading of 77 dBA at best cruise (3000 rpm) and only 81 dBA at WOT (4750 rpm). This is a huge reduction over most boats in class. The noticeably reduced sound level is part of Sea Ray’s "quiet ride" technology. By engineering noise reduction into the build process with features such as a proprietary tuned transom, inner laminate material, engineered fit-and-finish of all components to reduce vibration, and full beam bulkheads with acoustical insulation, there’s less operator and passenger fatigue. Now a casual conversation in the cockpit is possible, even while at cruise speed. The difference is immediately noticeable -- no meter is needed.


    The Sea Ray 300 SLX has a base price of $175,129 when powered with the 380-hp MerCruiser 8.2 MAG engine. I think this is plenty of power for this boat but twin engine options are available as long as buyers are willing to write the check. Twin 300 hp 350 MAG’s will add $20,492, and using these engines with Axius will add $41,892.


    I think the 300 SLX has a lot going for her. Among the perks that her size presents is indeed, the ability to carry a lot of people, and do it in style. This type of boat is not generally intended to be a second boat, but likely the primary boat. And as a primary boat she is ready for most anything. I found the 300 SLX to be one of the most innovative boat's in class and Sea Ray engineers and designers can be proud of the job they have done. And owners can be proud of her, too.

    Test Result Highlights

    • Top speed for the Sea Ray 300 SLX (2013-) is 46.8 mph (75.3 kph), burning 31.75 gallons per hour (gph) or 120.17 liters per hour (lph).
    • Best cruise for the Sea Ray 300 SLX (2013-) is 26.1 mph (42 kph), and the boat gets 2.38 miles per gallon (mpg) or 1.01 kilometers per liter (kpl), giving the boat a cruising range of 279 miles (449.01 kilometers).
    • Tested power is 1 x 380-hp MerCruiser 8.2 MAG.

    Standard and Optional Features

    Marine Electronics

    GPS/Chart Standard
    VHF Radio Optional


    Battery Charger/Converter Optional
    CD Stereo Standard
    Head: Fixed Standard
    Shore Power Optional
    Shore Power Optional
    Trim Tabs Standard
    Windlass Optional


    Refrigerator Optional

    Exterior Features

    Carpet: Cockpit Standard Snap-in
    Outlet: 12-Volt Acc Standard
    Swim Ladder Standard
    Swim Platform Standard
    Tower: Watersports Standard
    Transom Shower Standard
    Wet bar Standard


    Bimini Top Standard
    Camper Back Optional
    Cockpit Cover Standard
    Full Canvas Optional


    Hull Warranty
    Limited lifetime

    Deck Warranty
    Limited lifetime
    Engine Warranty
    2-year limited
    NMMA Certification Yes


    Pricing Range: $175,129.00

    Prices, features, designs, and equipment are subject to change. Please see your local dealer or visit the builder's website for the latest information available on this boat model.