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FUEL ADDITIVES

Detroit Diesel engines are designed to operate satisfactorily on a wide range of diesel fuels. The
regular use of supplemental fuel additives is not required or recommended. Some additives may
be beneficial in addressing temporary fuel quality problems, but should not replace proper
fuel selection and handling.

WATER CONTAMINATION

Some fuel additives provide temporary benefit when fuel is contaminated with water. They are
not intended to replace good fuel handling practices. Where water contamination is a concern, the
fuel system should be equipped with a fuel/water separator that should be serviced regularly. In
marine and other environments where microbe growth is a problem, a fungicide such as Biobor®
JF (or equivalent) may be used.

Microbial activity may be confirmed with commercially available
test kits. Follow the manufacturer's instructions for treatment. Avoid the use of fungicides
containing chlorine, bromine or fluorine compounds, since these may cause fuel system corrosion.
When small amounts of water are present, supplemental additives containing methyl carbitol or
butyl cellusolve are effective.

Follow the manufacturer's instructions for their use. The use of
isopropyl alcohol is no longer recommended due to its negative effect on fuel lubricity.

FUEL ADDITIVES THAT ARE NOT ALLOWED

The following fuel additives are NOT allowed:

Used Lubricating Oil – Detroit Diesel specifically prohibits the use of drained lubricating oil in
diesel fuel. Used lubricating oil contains combustion acids and particulate materials, which erode
injector components, resulting in loss of power and increased exhaust emissions. In addition,
the use of drained lubricating oil will increase maintenance requirements due to filter plugging
and combustion deposits. Refer to Section 3.14, “Waste Oil Disposal and Rerefined Oils,” for
recommendations on proper used oil disposal.