Mercury MerCruiser Product Applications Manual page 14

One Star - Low emission
Two Stars - Very Low emission
Three Stars - Ultra Low emission
Four Stars - Super Ultra Low emission
90-863758060 AUGUST 2006
The one‑star label identifies personal watercraft, outboard,
sterndrive and inboard engines that meet the Air Resources
Board's Personal Watercraft and Outboard marine engine
2001 exhaust emission standards. Engines meeting these
standards have 75% lower emissions than conventional
carbureted two‑stroke engines. These engines are
equivalent to the U.S. EPA's 2006 standards for marine
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engines.
The two‑star label identifies personal watercraft, outboard,
sterndrive and inboard engines that meet the Air Resources
Board's Personal Watercraft and Outboard marine engine
2004 exhaust emission standards. Engines meeting these
standards have 20% lower emissions than One Star ‑
Low‑Emission engines.
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The three‑star label identifies engines that meet the Air
Resources Board's Personal Watercraft and Outboard
marine engine 2008 exhaust emission standards or the
Sterndrive and Inboard marine engine 2003 exhaust
emission standards. Engines meeting these standards
have 65% lower emissions than One Star ‑ Low Emission
engines.
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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.
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Important Information
Page 1A-9