Yamaha - Oil Pan Engine Lubrication System 6EK-15311-01-00. Overview. Oil pans don't get much attention until there's a leak or you're chasing down low oil pressure. From working on Yamaha outboards, I've seen how important it is to have a solid pan that keeps everything sealed and flowing the way it should. It's sitting at the bottom of the engine taking heat, vibration, and whatever the water throws at it. When it's in good shape, you don't think about it-and that's exactly how it should be..