SIERRA Synthetic Blend 25W-40 Catalyst Engine Oil

Sierra Synthetic Blend 25W-40 Catalyst-Compatible Marine Engine Oil

SIERRA Synthetic Blend 25W-40 Catalyst Engine Oil is a premium marine motor oil engineered specifically for modern 4-stroke outboard, sterndrive, and inboard engines. It is formulated to protect high-performance marine engines while safeguarding sensitive emission catalyst exhaust systems.

Key Specifications & Certifications

• Viscosity Grade: 25W-40
• Certifications: NMMA FC-W Certified and API-SL compliant.
• Catalyst Compatibility: Formulated with advanced ZDDP (Zinc Dialkyldithiophosphate) anti-wear technology designed to prevent phosphorus depletion, which directly extends the life of your emission catalyst systems.
• Interchangeability: It serves as a direct, high-quality replacement for Mercury/Mercruiser 25W-40 marine oils.

Primary Performance Benefits

• Corrosion Protection: Provides upgraded defenses against moisture and salt damage common in harsh marine environments.
• Thermal Stability: Prevents engine sludge formation and excessive oil thinning under high RPMs, heavy loads, and extreme operating temperatures.
• Deposit Control: Delivers industry-leading detergency to keep pistons clean and minimize ring deposits.

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