Four Stars ‑ Super Ultra Low Emission
The Four Star label identifies engines that meet
the Air Resources Board's Sterndrive and Inboard
marine engine 2009 exhaust emission standards.
Personal Watercraft and Outboard marine
engines may also comply with these standards.
Engines meeting these standards have 90% lower
emissions than One Star ‑ Low Emission engines.
EPA Emissions Regulations
All new outboards manufactured by Mercury Marine are certified
to the United States Environmental Protection Agency, as
conforming to the requirements of the regulations for the control of
air pollution from new outboard motors. This certification is
contingent on certain adjustments set to factory standards. For this
reason, the factory procedure for servicing the product must be
strictly followed and, wherever practicable, returned to the original
intent of the design. Maintenance, replacement, or repair of the
emission control devices and systems may be performed by any
marine spark ignition (SI) engine repair establishment or individual.
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