What is the oil capacity and grade?

• A. 8 quarts 10w30
• B. 6 quarts 5w20
• C. 10 quarts 10w40
• D. 4 quarts 10w40

Answer: (A)

Knowing the engine’s oil capacity and viscosity grade ensures proper lubrication and reliable engine protection. For the 29'RBS II boat engine, the specified oil capacity is eight quarts, and the recommended viscosity is 10W-30. The eight-quart amount accounts for the sump, engine passages, and the oil in the filter after a drain, so that oil pressure stays within normal range and the engine stays properly lubricated during operation. The 10W-30 grade is a multi-viscosity oil that flows well at cold starts (the 10W part) and provides adequate film strength at operating temperature (the 30 part), making it suitable for a broad range of temperatures you’d encounter in marine use. Other options either suggest too little oil for the system, or an unusual viscosity for this engine, which could lead to inadequate lubrication or improper oil pressure.