We’ve had a flood in the engine bay resulting in water getting into the PRM 150 gearbox. It has been emptied and refilled but the oil is still milky. Do we just repeat until satisfactory or is there a product that would help? We normally put in Morris Classic Marine oil (API CC) but would a different grade, or their flushing oil be better for shifting water? Should the engine be run in neutral or in gear to circulate the oil/product before then draining?