Mercury & Mariner Outboard Oil, Fluids, & Additives
Keep your outboard running stronger, longer. OBParts stocks OEM and premium aftermarket oils, fluids, and additives for every season—from spring break-in to winterization. All core lubricants meet or exceed NMMA TC-W3 (2-stroke) and FC-W (4-stroke) standards, protecting against corrosion, carbon, and high-load wear in harsh marine environments.
Shop by need:
- 2-Stroke Oils (TC-W3): Mineral, semi-synthetic, and full synthetic—including OEM blends (e.g., XD50/XD100) optimized for injector and carb models to reduce smoke and ring sticking.
- 4-Stroke Oils (FC-W): 10W-30, 25W-40, and high-load synthetics engineered for anti-shear stability, rust inhibition, and saltwater protection.
- Gearcase / Lower Unit Lubes: 80W-90 and 75W-90 synthetic formulas with water-separation and extreme-pressure additives for cone-clutch and dog-clutch designs.
- Power Trim & Steering Fluid: Anti-foaming, anti-wear hydraulic fluids for smooth tilt/trim and helm feel in all temps.
- Fuel Additives: Ethanol treatment, fuel stabilizer, injector cleaner, carbon/decarb formulas, and “ring-free” detergents for top-end cleanliness.
- Storage & Corrosion Care: Fogging oil, protective sprays, dielectric grease, and marine multi-purpose grease for splines, pivots, and steering
18 of 18 Items
18 of 18 Items