Marine engines require other oils than passenger cars or motorcycles. Due to their longer time of staying, engine oils need specific additives and need to perform well under high engine performances. As with other oils, it needs the choice between synthetic, semi-synthetic and mineral oils. For the oil selection it needs the control of the required engine oil. Never use a synthetic one if a mineral oil is permitted. In common, all outboard engines need a high viscosity oil. That counts for 2-stroke as for 4-stroke outboarders.