January 2025 Column Marine Engine Oil…it’s
different from what you put in your car.
By Capt. John N.Raguso
Most outboard marine engines sitting on the stern of a variety of craft at your local marina are four-stroke gasoline fueled motors. Sure there are still a few two-strokes to be seen from the early 2000s, along with the occasion diesel or propane flavors, but if you look up and down the docks, four-stroke gasoline outboards are the power of choice. A question I get asked a lot as a seminar speaker, writer and charter boat captain is, “is it okay to use automotive engine oil in my four-stroke outboard, inboard or stern drive?” My simple one-word answer is “no”, that’s a really bad idea. Now let’s take a deeper dive into myriad reasons for this inflexible, absolute response.
DIFFERENT STROKES
Automotive and marine four-stroke engines are designed to run quite differently. In order to meet emissions and fuel economy standards, automotive engines are calibrated to operate within a certain RPM range and seldom see any heavy loads. They are typically running at low revs (1500-2000 rpm), even at 55-to-65 mph highway speeds, at a controlled temperature that ensures consistent operation and fuel usage. In contrast, marine engines consistently generate higher RPM (3500-to-5000 rpm or more) and loads, as if the engine was trying to push up a never-ending hill mired in first gear. Marine engine oil has to resist shear, moisture and corrosion more than automotive engine oil and has to have extremely strong film strength to protect engine parts under constant stress and load. Finally, marine engines often go past their 100-hour or once-a-season oil change window, so anti-oxidants are critical to extending oil lifespan. The function of engine oil is to reduce friction and wear; carry away engine heat by being circulated and cooled in a closed loop system; to minimize rust and corrosion by preventing air or moisture from contacting bare metal; to remove contaminants by carrying them to a filtration system and/or settling them in a reservoir; and to seal and lubricate flexing piston rings during the four-stroke combustion process.
According to Mercury Marine engineers, engine attitude in outboard applications is much different than in an automotive application, with the engine most often configured vertically. The job of an oil in a vertically-oriented engine is even more challenging because it has to flow up and down while providing consistent protection throughout the engine. Lubricating cylinders and bearings at the top of the engine can be more difficult and lubricating individual cylinders, crankshaft and rod bearing journals can also be challenging.
Because marine engine oils have to protect against so many marine-specific things (corrosion, oxidation, shear, moisture), additives are much more important in a marine oil blend than in an automotive blend. Accordingly, marine blends typically contain 20-to-35% additives, while automotive blends contain about 10to-20% additives. Mercury’s Quicksilver marine engine oils contain significant amounts of anti-wear additives that help protect marine engines from friction that can result from excessive loads and the challenges brought on by their configuration.
In short, automotive engine oils are blended for mileage, emissions and efficiency and are not suitable for use in marine engines. Marine Engine Oils are tested and proven to protect against rust and corrosion, offer increased wear protection and have optimum viscosity retention. They have also been extensively lab-tested and proven to protect marine engines better than leading automotive engine oils. Using automotive oils in your marine engine can also void its warranty…yikes!
DIFFERENT TYPES OF MARINE ENGINE OILS
Not all marine engine oils are created equally and they can be divided into three basic groups, specifically mineral, synthetic blend and full synthetic. Non-synthetic oil, often referred to as mineral-based oil, is a product of the petroleum refining process, where the different elements of crude oil are separated through a distillation process. This is the same process that produces gasoline, diesel fuel and other petroleum products. Lubricating oils manufactured through this process are considered Group I (gear oil, industrial) and Group II (engine oil) and work well for many applications, but their molecular structure is inconsistent. Visualize the molecules of non-synthetic lubricants like a jar full of different sized rocks.
Synthetic lubricants (Group III) are produced through a (chemical synthesis process) higher grade refining process where molecules are broken down and rebuilt into a unifor m structure. The higher the refining process, the more pure the base oil becomes and typically, the higher the lubrication quality of the oil. The advantage of synthetic lubricants is they have a consistent molecular structure. If the molecules of a non-synthetic lubricant are like a jar of rocks, picture the molecules of a synthetic lubricant like a jar of uniformly-sized marbles. Now imagine sticking your hand in each jar…it would definitely be easier to slip your hand into the jar of marbles!
Semi-synthetic lubricants are blend of synthetic and mineral base oils and typically contain up to 30-percent synthetic. Semi-synthetic oil imparts some level of synthetic lubrication qualities and oil stability to a mineral blend. While not as high a quality of lubricant as full-synthetic, it is a higher quality lubricant than a standard mineral oil.
DECODING MARINE OIL…READ THE LABEL
Let’s break down a typical marine engine oil label and determine its intended usage. For this analysis, we’ll use 25W-40 as our example. So what does this mean? The “W” in the label stands for winter and the other parts of the nomenclature show that this is a multi-viscosity oil that thins out to 25-weight in colder temps (winter) to provide less friction for faster engine starts. During warmer months it thickens up its viscosity to 40-weight for maximum lubrication potential. Boaters living further north up the coast typically prefer a 10W-30 oil.
As a final tip on marine engine oil, fall is the best time to do a 100-hour/annual oil and filter change when winterizing your motor. You want to remove all the acids that can cause corrosion and other damage to your engine. Doing the oil change in fall also removes any water intrusion before it can separate from the oil, freeze and cause corrosion. In next month’s column, we’ll review the “factory-approved way” to check your engine’s oil level and how to interpret the dipstick.
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Twin Yamaha F425 Outboards With ONLY 78 Engine Hours! This Beautiful Express Cruisers, Voted One Of The Top 25 Ever Made $399,900(a56307)
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29' SEA RAY2001 290 AMBERJACK
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Very clean, professionally maintained. Engines are almost new. 350 Merc MPI, 260 hrs port, only 60 hrs starboard. She will take you anywhere in style. (h51140)
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Contact Direct
29' MONTEREY1999 296 CRUISER
Twin Mercruiser 5.7L EFI w/Bravo 3 outdrives, AC, GEN, Garmin GPS, radar, FF, DF, VHF, stereo, complete Eisenglass, fully loaded, turn key
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26'
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26' CHAPARRAL2003 SIGNATURE 260
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Yacht finders (631)
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Marine (631) 728-9200
200hp Yamaha's, warranty til 2026, low hours, electronic controls, loaded with option. Like New. Mint Condition. Brochure photo. $149,000 (h55454) Pat (914) 879-3971
F300 DEC 300HP.
South Main Street Freeport, NY 11520 Sales: 516-771-7020 Marina: 516- 546-8880 www.algroversmarine.com
23' GRADY WHITE2023 FREEDOM 235
Dual Console, fully loaded, Yamaha 300hp, electronic steering - warranty thru 2027. Anchor, windlass, bow cover, 12" Garmin, VHF, Stereo, enclosure $135,000(h54267)
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23' CHAPARRAL1995 2335 SS
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Filled with luxury from the yacht style helm station, backlit aluminum carbon fiber dash panel, wrap around bow seating with flip-out
22' DUFFY2022 SUN CRUISER 22
The Duffy Power Rudder Drive System And DC 48 Volt Motor, Powered By 166 Volt Deep Cycle Batteries And Victron Multiplus Charger 120v $49,000 (a56247)
Port Of Egypt (631) 765-2445 (800) 244-8765 PoeMarine.com 22'
Upgraded Yamaha 250hp 4-Stroke with only 285 hrs. Includes T/A Venture trailer. Garmin GPS MAP 740s, icom VHF and much more ! $47,900(B55465)
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Nicolls Point (631) 589-8282 Contact Direct 22' MONTEREY2002 EXPLORER 220 SPORT
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' HURRICANE2016 SD2200 OB
Yamaha 200 HP XS200TXRB. Molded bow pulpit with bow seating and cushion. Additional rod holders installed on transom splash wall $28,900(c54207)
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Telescoping|Lighting. LED Docking Lights, Trim Gauge with Engine Package $32,500(a55060)
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Volvo Penta 4.3 L Stern drive duo prop. Aluminum T-Top with canvas. Remanufactured long block 2018, low hours. $7,500(c47531) All Island Marine (516) 764-3300
150 HP Yamaha with SST Prop, hydraulic steering, Lenco Trim Tabs, Livewell, Fresh water washdown, Garmin GPS MAP 5463, AM/FM satellite stereo $27,500(c56308)
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NEW Yamaha F250XB with 4 Hours. Custom fiberglass hard top. $69,500 (a53015)
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Versatility for the coastal living buyer to do everything on the water, from fishing in the morning, snorkeling and tubing in the afternoon $64,989(a55405)
Mariners Cove (631) 728-8060 MarinersCoveMarine.com 22'
Do it all on one boat. From wakesurfing and fishing, to cruising and entertaining, the 220 FSH Sport is the top choice for coastal living. $54,989(a55406)
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Yamaha 200 HP XS200TXRB. Molded bow pulpit with bow seating and cushion. Additional rod holders installed on transom splash wall, hydraulic steering $28,900(c56309)
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21' STRATOS1998 2160 CENTER CONSOLE
2021 225 HP Honda with warranty until July 2026. Package includes aluminum T-Top with instrument box and rod holders, trim tabs and more $26,111 (c55430)
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21' SEA RAY2016 21 SPX
The owner also added a 3 sided enclosure to keep you out of the weather. There is a factory trailer with this boat also. $29,995(a53420)
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21' ROBALO2018 R207
Excellent condition, every factory option plus more. Trailer included. 435 hours on Yamaha 200hp. Garmin GPSmap with high definition chip option. $47,000(h50574)
Paul (917) 596-3191
Contact Direct
Mercury 300XS Venture Alum trailer, Livorsi Gauges, Hyd Steering, Dual Batteries, Mooring & full canvas, new interior, new fuel tank very good cond $29,900(h53646)
Tony (347) 992-6286 Contact Direct
21' GRADY WHITE2020 FISHERMAN 216
Powered by Yamaha. 25 hours $89,900(a56269)
Spellmans Marine (631) 728-9200
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' SEA RAY1999 215 EXPRESS CRUISER
Merc 50 Alpha 1220 HP Tons of upgrades Beautifully maintained Super clean. Professionally serviced and winterized and has always been trailered. $15,500(h53689)
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(631) 728-8060
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21' SEA SWIRL1998 STRIPER WALKAROUND
Johnson 175HP, All maintenance up to date, electronics, bottom paint, Bimini Top, everything but VRO pump works $7,000(b55754)
Atlantic Marine A Tech Service (631) 655-7880
21' SEA KING2009 210 CC
Garmin electronics, t-top, fishbox, sirius radio, 150hp Yamaha 4-stroke outboard, 140 hours, runs like new, includes 2017 tidewate trailer. Price flexible. $18,000(h48414) Larry (917) 414-8592
Dual Console powered with 1993 150 HP 2 stroke. Hydraulic steering and bimini top. No Trailer. $8,900(c47463) All Island Marine (516) 764-3300
Doubles as a Pumpout Boat. Yanmar 30HP Diesel Engine w/under 20Hrs.Stereo, GPS, Refrigerator, Dual Batteries W/Switch, Battery Charger $30,000(c31754) City Island Yacht Sales (718) 885-2300
NEEDS WORK (HOLE ON SIDE). ENGINE RUNS GOOD $999(a56207)
Mariners Cove (631) 728-8060
Comfortable seating, quiet performance, and water sports capabilities $34,999(a55740)
Mariners Cove (631) 728-8060 MarinersCoveMarine.com
The 2024 Yamaha 195 FSH Sport isn’t just a boat—it’s your gateway to an extraordinary life on the water. $41,899 (a56209)
(631) 765-2445 (800) 244-8765
Introducing the 2025 Yamaha AR190 –Your Ultimate Adventure Awaits! Are you ready to elevate your boating experience? $40,999(a55741)
Mariners Cove (631) 728-8060
With its sleek design and cutting-edge features, this 19-foot masterpiece is guaranteed to turn heads everywhere you go. $44,999(a55739)
Mariners Cove (631) 728-8060
Mariners Cove (631) 728-8060 MarinersCoveMarine.com 19' YAMAHA2024 195S
Powerful Performance: With a 1.8L 4cylinder engine delivering 181 horsepower, the SX190 is engineered to glide effortlessly across the water. $14,999 (a56306)
Mariners Cove (631) 728-8060
MarinersCoveMarine.com 19' YAMAHA2013 SX190
(914) 844-4492
Mariners Cove (631) 728-8060
Powered by Mercury $49,900 (a55706) Spellmans Marine (631) 728-9200
' CAROLINA SKIFF2023 19 ULTRA ELITE
140 HP Suzuki in white Precision Control electric shift, a DF140BTGXW5. Also includes a fiberglass GT-Top with electronics box $45,990(c54276)
All Island Marine (516) 764-3300
115 HP Mercury, Includes SST prop, bimini top, swim ladder, and rod storage. Black hull. Plenty of room for few friends to tag along $17,490(c55429)
All Island Marine (516) 764-3300
Mercury 115 Optimax engine, Garmin GPS Map 440s, Garmin echo map DV, VHF, Live well, Console cover, Extra pole holders and much more $14,950 (c53805)
Westchester Yacht Sales (914) 844-4492
The Sport has the up-grade 4.3L MerCruiser V-6 190HP with low hours, Has the Ski Arch, Bimini Top, Bow and cockpit cover, Includes trailer $15,000 (c54734)
Westchester Yacht Sales (914) 844-4492
WestchesterYachtSales.com
Suzuki DF140 Outboard engine. Coast Guard and Mooring Package. Two Years of All Scheduled Maintenance. $38,085(a49279)
Moriches Boat & Motor (631) 878-0023 MorichesBoatAndMotor.com
V-6 200HP with less than 100 hours, GPS, Stereo, Storage cover, Includes trailer. $21,000(c51212)
Westchester Yacht Sales (914) 844-4492
WestchesterYachtSales.com
18' BAYLINER2018 ELEMENT F18
Mercury 115 Fuel Injected Four Stroke Outboard on the back and sits on a bunk trailer. Plenty of seating in this boat to bring out family and friends.15990 $15,990(a55782)
MorichesBoat & Motor (631) 878-0023
MorichesBoatAndMotor.com
' TIDEWATER2021
ADVENTURE Yamaha 115hp 4 stroke engine she is a runner. She has a couple baitwells and nice storage. She is priced to move fast. There is no trailer. $29,900 (a55712) Yacht Finders (631) 926-4753 (631) 806-2751 YachtFindersOnLine.com
MARINAS
• SUMMER STORAGE YEAR ROUND SPECIALS • GATED FACILITY • WINTER DOCKAGE Do It Yourselfers Welcome NOW AT
90 HP Yamaha and a 2022 Load Rite aluminum bunk trailer. Included is a bimini top with boot, bow cushions, SST split bow rail, hydraulic steering (c51014)
All Island Marine (516) 764-3300 allisland.com
2020 90 HP Honda, AB182800102T Load Rite aluminum I-Beam bunk trailer, Hummingbird depth finder/fish finder, bow cushions, SST prop and more $24,111(c54354)
All Island Marine (516) 764-3300
All Island Marine (516) 764-3300
