Purpose and Specifications

MOTUL INBOARD 4T 15W40 5L is a premium mineral engine oil designed for 4-stroke inboard marine engines in boats, both recreational and professional use on rivers or coasts. It delivers strong protection against rust from moisture and salt water, neutralizes acidic residues from fuel combustion, and prevents water emulsion to keep your engine running smooth in harsh marine conditions.

This 15W40 viscosity oil flows easily in cold starts down to 0°C for quick protection, while staying thick up to 150°C under full power loads, reducing wear and extending engine life. Meets ACEA E7 and API CI-4 standards, approved for brands like Caterpillar, Cummins, Volvo Penta, Yanmar, Mercruiser, and MTU. 5-liter can covers most inboard engines.

When to Use / Replace?

Use in naturally aspirated or turbocharged diesel and petrol inboard engines with direct injection or common rail systems. Ideal for demanding marine operation at full throttle in humid, salty environments.

• Replace every 150-250 hours of engine runtime or annually (whichever comes first) for optimal protection.
• Check oil level monthly; top up if low due to high-speed runs.
• Shelf life: 5 years unopened in cool, dry storage.

FAQ

Is this oil good for saltwater boats? Yes, it excels at fighting corrosion from salt and moisture, perfect for coastal or offshore use.

Can I use it in my Volvo Penta or Yanmar engine? Absolutely, it's approved for these and many others like Cummins and Mercruiser.

How often should I change it? Every 150-250 hours or yearly to maintain peak performance and prevent buildup.