Choose Between Two Options
- $89 for a basic boat winterization ($180 value)
- $49 for a basic personal-watercraft winterization ($100 value)
Marine Motor Oil: Working Hard So You Can Float with Ease
The oil that goes in your boat isn’t the same stuff that goes into your car. Read Groupon’s introduction to marine motor oil to learn why not.
If you’ve ever tried to run in a pool, you know it takes a lot more effort to move through water than it does to move across land. It’s the same for engines. Boat engines work much harder than car engines do, zipping through lakes, rivers, and choppy ocean waters. So it makes sense that they’d need a motor oil that works harder, too.
Marine motor oils are similar to high-performance motor oils used in cars, but with a few additives. Since boats tend to be submerged in water if you’re using them right, one key additive is an anti-corrosion compound that keeps excess moisture from mixing with the oil and causing engine components to rust. In addition, lubricants used in marine-grade oils are often more slippery than those used in automotive motor oils to keep up with the high demands of marine-engine operation.
Many marine motor oils are certified by the National Marine Manufacturers Association. To be certified, an oil must pass a rigorous certification program that includes bench tests for fluidity, filterability, rust prevention, and other criteria as well as a 100-hour performance engine test. Most boat-engine manufacturers recommend changing the oil after 100 hours—or sooner if you’re boating in an area with known oil leeches.