Our verdict
Mercury Marine Premium Marine Grease with PTFE is a must-have maintenance staple for boat owners wanting to protect propeller shafts, fittings, and steering components from corrosion and wear. Its waterproof, PTFE-enhanced formula stands up well to both saltwater and freshwater environments, making it a reliable choice for routine outboard and sterndrive maintenance. While the tube size may require frequent reordering for larger jobs, its performance and OEM-trusted reputation make it a worthwhile addition to any boater's toolkit.
Why it made the list
- Waterproof PTFE protection
- Prevents galvanic corrosion
- OEM-trusted formula
Pros & cons
What we like
- Excellent corrosion protection in salt and fresh water
- Stays in place under high-speed prop rotation
- Prevents galvanic corrosion between dissimilar metals
- Easy to apply with standard grease gun
- Trusted OEM formula specifically engineered for Mercury outboards
- Reasonably priced for the protection it provides
Watch out for
- Tube/cartridge size is small for larger maintenance jobs
- Can be messy if over-applied
- Not ideal for extreme high-temperature engine components
- Limited availability in some local marine stores
Spec sheet
| Container Size | 8 oz tube |
|---|---|
| Base Type | Lithium complex with PTFE |
| Water Resistance | Excellent (salt & freshwater) |
| Operating Temperature Range | -20°F to 350°F |
| NLGI Grade | Grade 2 |
Features at a glance
- PTFE-fortified formula for reduced friction
- Waterproof and resists saltwater wash-out
- Protects propeller shafts, fittings, and U-joints
- Compatible with all Mercury and Mercury-recommended fittings
- Extends service life of steering and gimbal components
- Easy-flow consistency for grease guns and cartridges
Full review
Mercury Marine marine grease is a purpose-built lubricant designed specifically for the demanding conditions boat owners face on the water, where saltwater exposure, constant vibration, and high-pressure friction can quickly degrade ordinary automotive greases. Formulated by Mercury Marine for use across their outboard and sterndrive product lines, this grease provides superior water resistance and corrosion protection for critical components like propeller shafts, gimbal bearings, steering systems, and trim tilt mechanisms. Boat owners who maintain their own engines rely on this grease because it resists washout even during extended saltwater runs, ensuring that moving parts stay protected mile after mile rather than breaking down prematurely from moisture infiltration.
What sets Mercury Marine marine grease apart is its tenacious, water-resistant formula that clings to metal surfaces rather than washing away or breaking down when submerged or exposed to spray. This is especially important for propeller shaft splines, where galvanic corrosion between dissimilar metals can seize components together if left unprotected, turning a simple prop swap into a costly repair job. The grease also handles extreme pressure applications well, making it suitable for gear lube interfaces and other high-load points where metal-to-metal contact generates significant heat and friction during normal operation.
Packaged in easy-to-use tubes that fit standard grease guns, Mercury Marine marine grease is a staple item for anyone performing routine winterization, spring commissioning, or mid-season maintenance on their outboard or sterndrive unit. Regular application according to the owner's manual schedule helps extend the service life of expensive drivetrain components and can prevent the kind of water intrusion that leads to bearing failure or shaft corrosion. Whether used by weekend anglers maintaining a single outboard or marina technicians servicing fleets of rental boats, this grease remains a trusted, manufacturer-recommended choice precisely because it's engineered to match the exact specifications and materials used in Mercury Marine propulsion systems.
Ready to rig it?
Mercury Marine Premium Marine Grease (2-4-C w/ PTFE)
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