Not sure what motor you have, but for 150, Yamaha says this:
Realizing the need to build cleaner-running outboards, Yamaha built the F150 to meet and exceed the 2006 Federal EPA emission standards and the 2008 California Air Resources Board (CARB) emission standards years ahead of time. In fact, the F150 attains a 3-Star Ultra Low Emissions rating from CARB, the highest rating CARB bestows on outboards.
An automatic oil-draining device drains the remaining oil from the oil filter to prevent oil spillage during oil filter changes. The oil stick tube extends down to the bottom of the oil pan allowing for better precision when checking oil levels and allowing the use of a suction tool for quick and easy oil changes.
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