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<TD align=middle width="50%">Document ID# 1531157
2003 HUMMER
H2 </TD>
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<H1>Advance Service Info - Top Tier Detergent Gasoline (Deposits, Fuel Economy,
No Start, Power, Performance, Stall Concerns) #04-06-00-047 -
(06/24/2004)</H1>Top Tier Detergent Gasoline (Deposits, Fuel Economy, No Start,
Power, Performance, Stall Concerns)

2005 and Prior All General Motors Passenger Cars and Trucks (U.S. Only)</P>

2003-2005 HUMMER H2</P>

A new class of gasoline, called Top Tier Detergent Gasoline, will be
appearing at retail stations of some fuel marketers. This gasoline meets
detergency standards developed by four automotive companies. A description of
the concept and benefits of Top Tier is provided in the following question and
answer section.</P>What is Top Tier Detergent Gasoline?

Top Tier Detergent Gasoline is a new class of gasoline with enhanced
detergency. It meets new, voluntary deposit control standards developed by four
automotive companies that exceed the detergent requirements imposed by the
EPA.</P>Who developed Top Tier Detergent Gasoline standards?

Top Tier Detergent Gasoline standards were developed by four automotive
companies: BMW, General Motors, Honda and Toyota.</P>Why was Top Tier
Detergent Gasoline developed?

Top Tier Detergent Gasoline was developed to increase the level of detergent
additive in gasoline. The EPA requires that all gasoline sold in the U.S.
contain a detergent additive. However, the requirement is minimal and in many
cases, is not sufficient to keep engines clean. In order to meet Top Tier
Detergent Gasoline standards, a higher level of detergent is needed than what is
required by the EPA. Also, Top Tier was developed to give fuel marketers the
opportunity to differentiate their product.</P>Why did the four automotive
companies join together to develop Top Tier?

All four corporations recognized the benefits to both the vehicle and the
consumer. Also, joining together emphasized that low detergency is an issue of
concern to several automotive companies.</P>What are the benefits of Top Tier
Detergent Gasoline?

Top Tier Detergent Gasoline will help keep engines cleaner than gasoline
containing the "Lowest Additive Concentration" set by the EPA. Clean engines
help provide optimal fuel economy and performance and reduced emissions. Also,
use of Top Tier Detergent Gasoline will help reduce deposit related
concerns.</P>Who should use Top Tier Detergent Gasoline?

All vehicles will benefit from using Top Tier Detergent Gasoline over
gasoline containing the "Lowest Additive Concentration" set by the EPA. Those
vehicles that have experienced deposit related concerns may especially benefit
from use of Top Tier Detergent Gasoline.</P>Where can Top Tier Detergent
Gasoline be purchased?

The Top Tier program began on May 3, 2004. Some fuel marketers have already
joined and are making plans to introduce Top Tier Detergent Gasoline. This is a
voluntary program and not all fuel marketers will offer this product. Once fuel
marketers make public announcements, a list of all fuel marketers meeting Top
Tier standards will be made available. For now, look for the "Top Tier"
designation at the gas pump.</P>

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<TD align=left width=778><FONT size=1>GM bulletins are intended for use by
professional technicians, NOT a "do-it-yourselfer". They are written
to inform these technicians of conditions that may occur on some vehicles,
or to provide information that could assist in the proper service of a
vehicle. Properly trained technicians have the equipment, tools,
safety instructions, and know-how to do a job properly and safely.
If a condition is described, DO NOT assume that the bulletin applies to
your vehicle, or that your vehicle will have that condition. See
your GM dealer for information on whether your vehicle may benefit from
the information.
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<TD align=middle width="50%">Document ID# 1531157
2003 HUMMER
H2 </TD>
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