Why choose Cat® Tier 4 Final marine engines? Don’t base your decision on anticipated results. Base it on real-world, real-time outcomes. Our product line doesn’t simply meet the latest marine engine emissions regulations — our Tier 4 Final engines are performing in engine rooms, on the water, day in and day out. They’re exceeding marine customers’ high expectations for reliability, durability, ease of installation and simplicity of maintenance. And they’re doing it efficiently, lowering your fuel consumption and your costs.