Anyway, I have a 2004 or 2005 9.8 Nissan/Tohatsu and I need to change the engine oil. In the Autumn, I had the engine winterized, but the place that did that wouldn't change the engine oil unless I paid them an addition $80.00. From what I understand, which isn't much, changing the engine oil on outboards is a pretty straight forward process; I read with interest the similar topic about the Honda outboard.