030604017O

Bulletin No.:
Service Bulletin
Date:
03-06-04-017O
November, 2020
INFORMATION
Subject:
Information on Diesel Fuel Additives
Models:
2021 Cadillac Escalade
2014-2015 Chevrolet Cruze (RPO LUZ)
2017-2019 Chevrolet Cruze (Gen II – VIN B) (RPO LH7)
2016-2021 Chevrolet Colorado
2018-2019 Chevrolet Equinox (RPO LH7)
2017-2021 Chevrolet Express (RPO LWN)
2021 Chevrolet Suburban, Tahoe
2016-2021 GMC Canyon
2018-2019 GMC Terrain (RPO LH7)
2017-2021 GMC Savana (RPO LWN)
2021 GMC Yukon
2021 and Prior GM Chevrolet and GMC Light Duty and Medium Duty Trucks
Attention: This bulletin also applies to any of the above models that may be Export from North
America vehicles.
This bulletin has been revised to add the 2021 Model Year to certain vehicles, correct the
Model Years for Equinox and Terrain and update the information throughout the bulletin.
Please discard Corporate Bulletin Number 03-06-04-017N.
TOP TIER Detergent Diesel is highly recommended for
use with diesel vehicles. If your area does not have
TOP TIER Detergent Diesel, GM recommends the use
of ACDelco Diesel Fuel Conditioner. This will help you
maintain optimal engine performance. In the event you
refuel using low-quality diesel, GM recommends adding
ACDelco Fuel System Treatment Plus-Diesel. This can
help clean engine deposits and is available at your GM
dealership.
Common Diesel Fuel Concerns
Fuel Waxing/Icing
Fuel distributors blend #1 and #2 diesel fuels* for
seasonal requirements in a particular region. No other
blending of fuels is recommended. However, a
customer may desire to use a winter fuel additive to
prevent fuel waxing or icing during extreme cold snaps.
If a winter fuel additive is to be used, GM recommends
the use of ACDelco Diesel Cold Flow Additive.
*In Canada, Diesel fuel blend #1 is categorized as type
A (Winter) and blend #2 is categorized as type B
(Summer).
Copyright 2020 General Motors LLC. All Rights Reserved.
Low Cetane Number
The cetane number is one indicator of a diesel fuel's
ability to ignite. There are many indicators of overall
fuel quality such as cleanliness, specific gravity,
volatility, viscosity, detergency, corrosion inhibiting
abilities, and lubricity. Increasing the cetane number
alone is not a fix for poor quality fuel. Additionally,
increasing the cetane number beyond the engine's
requirements will not increase performance. However,
the cetane number of diesel fuel is not always
consistent and some customers may desire to use a
cetane improver to ensure full performance of their
engine. If such an additive is to be used, GM
recommends the use of ACDelco Diesel Fuel
Conditioner additive.
Poor Lubricity
GM Diesel engines are designed to operate on today's
low sulfur fuel without the use of additives. A fuel
additive designed to increase lubricity is not a fix for
poor quality or contaminated fuel, but some customers
may desire to use a lubricity additive to aid in the
longevity of their fuel system components. If such an
additive is to be used, GM recommends the use of
ACDelco Diesel Fuel Maintenance Additive or ACDelco
Diesel Fuel Conditioner additive.
Page 2
November, 2020
Fuel Stability
Fuel stability and degradation may be a concern for
diesel fuels, especially for diesel fuel containing
biodiesel. Use of aftermarket stability additives to
improve the quality of a degraded fuel is not a fix and
use of such aftermarket stability additives by customers
is discouraged due to concerns of proper mixing and
fuel compatibility. However some customers may desire
to use a stability additive to increase the shelf life of
their fuel. If such an additive is to be used, GM
recommends the use of ACDelco Diesel Fuel
Conditioner additive.
Injector Deposits
Modern common rail fuel injection systems can have
lower tolerance for deposit formation due to tighter
tolerances found in today’s diesel engine fuel systems.
However, these same common rail fuel systems create
a more reactive environment for deposit formation due
to higher operating pressures and temperatures. Diesel
fuel injector fouling involves deposit formation on the
external and/or internal surfaces of the injector and
nozzle. Use of detergent based fuel additives can clean
and prevent injector deposit formation in diesel engines
running on poor quality fuels. If such an additive is to be
used, GM recommends the use of ACDelco Diesel Fuel
Maintenance Additive or ACDelco Diesel Fuel
Conditioner additive.
Fuel Source Issue
If a vehicle is properly maintained but has fuel
contamination issues, consider obtaining fuel from a
different source. Purchasing fuel from a high volume
fuel retailer increases the chance that the fuel is fresh
and of good quality.
Bulletin No.: 03-06-04-017O
Parts information
GM ACDelco Diesel Fuel Conditioner
GM ACDelco Diesel Fuel Conditioner®, P/N 19419985
(U.S.*), is alcohol free and metal free additive. It is
multifunctional additive and provides benefits of
cleaning engine deposits, improved lubricity, improved
cold temperature fuel flow, reduced fuel filter plugging,
corrosion protection, enhanced fuel stability and cetane
boost.
GM ACDelco Diesel Fuel Maintenance Additive
GM ACDelco Diesel Fuel Maintenance® Additive, P/N
19419458 (U.S.*), is an alcohol free and metal free
additive. It is a multifunctional additive and provides
benefits of cleaning engine deposits, improved lubricity
and corrosion protection.
GM ACDelco Diesel Cold Flow Additive
GM ACDelco Diesel Cold Flow® Additive, P/N
19419986 (U.S.*), is an alcohol free and metal free
additive. It provides protection from filter plugging in
cold winter conditions linked to wax formation in diesel
fuels.
GM ACDelco Fuel System Treatment Plus
If the customer experiences concerns related to fuel
injector deposits, then the use of FUEL SYSTEM
TREATMENT PLUS® – DIESEL, P/N 88865597 (in
Canada, P/N 88865600), is allowed based on a
recommendation from the dealership technician. This is
a highly concentrated product and should be used as
per defined guidelines.
*Canadian P/N will be published when available.
Trademark Information
Duramax® is a Registered Trademark of General
Motors LLC (In the United States)
Duramax™ is a Trademark of General Motors LLC
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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