Why Mercury Marine Precision Oils Matter

Marine engines work under extreme stress: long hours at high RPMs, saltwater exposure, and seasonal inactivity. Mercury Marine Precision Oils & Lubricants are engineered to withstand these challenges—offering superior wear protection, corrosion resistance, and reliable performance across every component.

Mercury 2-Stroke Engine Oils

• Premium Plus 2-Stroke Oil: For high-horsepower and direct-injection engines; reduces carbon buildup and exceeds TC-W3 standards.
• OptiMax/DFI Oil: Synthetic-blend for OptiMax and DFI engines; offers top-end protection and reduced piston scuffing.
• Premium 2-Cycle Oil: Ideal for low- to mid-horsepower 2-strokes; reduces corrosion and is safe for premix and oil-injected systems.

Mercury 4-Stroke Engine Oils

• FC-W 25W-40: Exceeds all marine 4-stroke requirements; approved for all outboards and sterndrives.
• 25W-40 Synthetic Blend: Designed for supercharged Verado engines; maintains viscosity under high heat and RPM.
• 10W-30: Suitable for all Mercury 4-stroke outboards; provides excellent lubricity and corrosion protection.
• Verado Racing Oil: Built for high-output and racing applications; retains performance under severe engine load and temperature swings.

Gear Lubricants for Mercury Outboards

• Premium SAE 80W-90 Gear Lube: Ideal for outboards under 75 HP; protects against wear and pitting—even in the presence of water.
• High-Performance SAE 90 Gear Lube: Designed for higher-horsepower and sterndrive units; features synthetic EP additives to protect under extreme loads.

Diesel Engine Protection

15W-40 Diesel Engine Oil: Developed for marine diesel engines, including MerCruiser D-Tronic. Offers excellent wear tolerance, shear stability, and varnish/sludge control in stressed conditions.

Recommended Products for Mercury 60 HP 4-Stroke

• Engine Oil: Mercury 10W-30 or 25W-40 FC-W certified oil
• Lower Unit Oil: Mercury Premium SAE 80W-90 Gear Lube
• Oil Capacity: Lower unit: ~10.8 oz (320 mL)

Mercury Oil Maintenance Tips

• Change oil after the first 20 hours (break-in), then every 100 hours or annually.
• Replace oil filter during each oil change.
• Always use FC-W certified marine oils—never automotive oil.

How to Check Your Oil Level

1. Ensure the engine is vertical and off.
2. Remove cowling and pull the dipstick.
3. Wipe, reinsert, then remove again to read level.
4. Oil should be between “Min” and “Max.”
5. Top off if low; don’t overfill.

Steps to Change Oil in a 4-Stroke Mercury Outboard

1. Warm the engine for 5 minutes.
2. Drain oil via plug or use extraction pump.
3. Replace oil filter with a Mercury-approved filter.
4. Refill with Mercury 10W-30 or 25W-40.
5. Check oil level and inspect for leaks.