Bel-Ray 4T Semi – Marine 4‑Stroke Semi-Synthetic Engine Oil
Bel-Ray 4T Semi is a premium semi-synthetic marine engine oil engineered to deliver superior protection, power, and reliability in harsh saltwater and freshwater conditions. Designed for modern 4-stroke marine engines, it ensures smooth operation, cooler running, and long-lasting performance.
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Advanced protection: Synthetic blend with Extreme Pressure anti-wear agents plus robust anti-rust and anti-corrosion additives for maximum component life.
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Performance boost: Helps lower engine temperatures and unlocks horsepower for crisp throttle response.
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Extended service: Stable viscosity and oxidation resistance support extended oil change intervals.
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Wide compatibility: Ideal for 4-stroke PWC, outboard, inboard, and stern drive engines.
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NMMA FC-W rated: Meets marine industry standards for protection, detergency, and shear stability.
Whether you’re cruising, towing, or running hard offshore, Bel-Ray 4T Semi delivers clean operation, reduced wear, and reliable corrosion defense—so your engine performs at its peak season after season.
