Here are a few reasons why:
Viscosity: The main difference between 10w30 and 30-weight oil is their viscosity, which refers to their thickness or resistance to flow. 30-weight oil is thicker and has a higher viscosity than 10w30 oil, which is thinner and has a lower viscosity.
The specific viscosity requirements for your boat engine depend on factors such as the engine design, operating conditions, and ambient temperatures. Using an oil with a different viscosity than recommended can affect the oil's ability to provide adequate lubrication, cooling, and protection for the engine components.
Engine Performance: Using an oil with an inappropriate viscosity can impact engine performance. Thicker oil (higher viscosity) can increase friction and reduce fuel efficiency, while thinner oil (lower viscosity) may not provide sufficient protection for engine parts, especially in high-temperature conditions.
Engine Damage: In severe cases, using an oil with an unsuitable viscosity can lead to engine damage, including increased wear and tear on engine components, oil starvation (insufficient oil flow), and overheating.
Manufacturer Recommendations: Boat engine manufacturers typically specify the recommended oil viscosity for their engines in the owner's manual or maintenance guide. Deviating from these recommendations without consulting a professional can void your warranty and lead to potential issues.
For these reasons, it is advisable to use the oil type and viscosity recommended by the boat engine manufacturer. If you have any doubts or questions about oil selection, consult with a qualified marine mechanic who is familiar with your specific boat and engine.
