how can i add smoke to the fire left on the water?

Originally Posted by MONOLITH

I understand what he's saying now.

The smoke stays on the oil fire as long as the ship is considered "alive" by the game engine. As soon as the ship sinks, and the kill is scored, the game engine turns off the smoke. But your oil fire effect is still there. Then you have an oil slick fire with no smoke.

The game engine connects the smoke with the ships status, not the fire graphic.

yep, thats it exactly.