Mercury MerCruiser Service Manual page 16

Emissions Control
All Mercury MerCruiser engines (500 hp and below) will have a Three‑Star Ultra Low Emission rating or Four‑Star Super Ultra
Low Emission rating. The Star label identifies that these engines meet the California Air Resources Board's sterndrive and
inboard marine engine 2007 and later exhaust emission standards. Engines meeting these standards have 65–90% lower
emissions than One‑Star ‑ Low Emission engines.
The Star label will be affixed on the left side of the hull as shown.
XX 1234 XX
a
One Star ‑ Low emission
22531
Two Stars ‑ Very Low emission
42537
Three Stars ‑ Ultra Low emission
42538
Four Stars ‑ Super Ultra Low emission
42539
Page 1B-4
b
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. EPAs 2006
standards for marine 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.
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.
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.
© 2016 Mercury Marine
a - Recommended location
b - Secondary location
32770
90-8M0099748 eng DECEMBER 2015