Engine Coolant; Fuel; Gasoline Octane - freightliner WALK-IN VAN CHASSIS Operator's Manual

Engine Coolant

NOTICE
If an improper coolant mixture is used, the en-
gine could overheat and be damaged. The repair
cost would not be covered by the warranty. Too
much water in the mixture can freeze and crack
the engine, radiator, heater core, and other parts.
For the gasoline engine, a 50/50 mixture of clean
water and DEX-COOL® coolant should be used. If
this mixture is used, nothing else needs to be added.
This mixture will—
•
give freezing protection down to –34°F
(–37°C);
•
give boiling protection up to 265°F (129°C);
•
protect against rust and corrosion;
•
not damage aluminum parts;
•
help keep the proper engine temperature.
NOTICE
If extra inhibitors and/or additives are used in the
vehicle's cooling system, the cooling system
could be damaged. Use only the proper mixture
of the engine coolant and water listed here for
the cooling system.

Fuel

IMPORTANT: Using the recommended fuel
(gasoline) is important for proper maintenance
of the engine. To help keep the engine clean
and maintain optimum vehicle performance,
General Motors recommends the use of gaso-
line advertised as TOP TIER detergent gasoline.
Any resulting engine damage due from the use
of unapproved fuel (gasoline) would not be cov-
ered by the vehicle warranty.
NOTICE
Do not use ethanol fuel (E85) in the vehicle. The
engine is not designed for this fuel, and serious
engine damage will result if it is used.
GM Gasoline Engine

Gasoline Octane

Use regular unleaded gasoline with a posted octane
rating of 87 or higher. If the octane rating is less than
87, an audible knocking noise may occur. If this hap-
pens, use a gasoline rated at 87 octane or higher as
soon as possible. If gasoline rated at 87 octane or
higher is being used and a heavy knocking is heard,
the engine needs service.
Gasoline Specifications
Gasoline should meet the American Society for Test-
ing and Materials (ASTM) specification D4814 in the
United States or CAN/CGSB-3.5 or 3.511 in Canada.
Some gasolines contain an octane-enhancing addi-
tive called methylcyclopentadienyl manganese tricar-
bonyl (MMT). General Motors does not recommend
the use of gasolines containing MMT. Gasoline con-
taining MMT can reduce the life of spark plugs and
the performance of the emission control system
could also be affected. The malfunction indicator
lamp (MIL) might come on if gasoline with MMT is
used. If this happens, take the vehicle to a dealer for
service.
Additives
To provide cleaner air, all gasoline in the United
States is now required to contain additives that help
prevent engine and fuel system deposits from form-
ing, allowing the emission control system to work
properly. In most cases, you should not have to add
anything to the fuel. However, some gasolines con-
tain only the minimum amount of additive required to
meet EPA regulations. To help keep fuel injectors
and intake valves clean, or if the vehicle experiences
problems due to dirty injectors or valves, look for
gasoline that is advertised as TOP TIER detergent
gasoline.
For those who do not use TOP TIER detergent gaso-
line regularly, one bottle of GM Fuel System Treat-
ment Plus, added to the fuel tank at every engine oil
change, can help clean deposits from fuel injectors
and intake valves. GM Fuel System Treatment Plus
is the only gasoline additive recommended by Gen-
eral Motors.
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