AMSOIL Diesel Cold Flow Improver
AMSOIL Cold
Flow Improver (ACF) has been reformulated to provide
maximum cold flow capabilities in diesel fuels. The
new formulation provides superior performance over
the former DFF formulation, which is available while
supplies last.
Cold Weather and Diesel Fuel
As the temperature drops, the wax
naturally found in diesel fuel begins to form crystals.
The point at which wax crystals form is known as the
cloud point. These wax crystals eventually clog the
fuel filter and starve the engine of fuel or prevent
it from starting. While low-quality fuels may form
wax crystals in temperatures as warm as 40°F (4°C),
most fuels have a cloud point near 32°F (0°C).
#1 Diesel Fuel
One traditional solution to cold-weather
problems in diesel engines is the use of #1 diesel
fuel, which is diesel fuel diluted with kerosene.
While #1 diesel fuel has an advantage in low temperature
operability, there are also several disadvantages.
The energy content of #1 diesel fuel is about 95 percent
of #2 diesel fuel, resulting in reduced fuel economy
and less horsepower. In addition, the kerosene used
in #1 diesel fuel provides less lubrication for the
fuel pump and fuel distributor, increasing the likelihood
for wear on these critical components.
Cold Weather Performance Parameters
There are several areas of diesel
fuel improvement touted by various cold flow additive
manufacturers, including pour point, cloud point and
cold filter plugging point (CFPP). Many claims can
be misleading, so it is important to understand this
terminology in order to determine which products truly
provide superior performance.
It is important to distinguish between
CFPP and pour point. Many competitive products make
great claims regarding pour point, leading consumers
to believe their products are superior when they actually
have an inferior CFPP. Once fuel surpasses its cloud
point, the wax crystals begin to clog the fuel filter.
The CFPP temperature is a more important characteristic
than pour point because the engine will not run if
fuel cannot pass through the fuel filter.
AMSOIL Cold Flow Improver
AMSOIL Cold Flow Improver provides
superior fuel flow to help prevent filter plugging
in cold temperatures. It is formulated for a broad
range of diesel fuels, including #1 diesel fuel, #2
diesel fuel, biodiesel and hard-to-treat ULSD fuels.
AMSOIL Cold Flow Improver minimizes the need for blending
standard #2 diesel fuel with lower quality #1 diesel
fuel, helping maintain fuel economy and keep engines
functioning normally. It is also excellent for use
with home heating oil and kerosene heat systems.
AMSOIL Cold Flow Improver uses a
jet-fuel-type deicer that disperses water to control
ice formation throughout the fuel system. It inhibits
wax crystal formation and can improve diesel pour
point by as much as 58°F (32°C), allowing
fuel to flow to the engine more easily and improving
diesel engine reliability in cold temperatures. In
addition, AMSOIL Cold Flow Improver lowers the CFPP
by as much as 34°F (18°C) in ULSD.
Concentrated ACF vs. ACF Blended
with Fuel
The new formulation of AMSOIL Cold
Flow Improver will show no signs of solidifying in
its concentrated state in the bottle until the temperature
reaches -22°F (-30°C), a great improvement
over the previous formulation, which solidified in
the bottle at 0°F (-18°C). Cold Flow Improver
will only freeze in its concentrated state, and AMSOIL
recommends storing it at temperatures above 0°F
(-18°C). If ACF is allowed to freeze in the bottle
it can be thawed and used. When mixed with diesel
fuel, ACF effectively improves diesel fuel cold temperature
properties. It is recommended, however, that fuel
be treated at temperatures above 32° F (0°C).
ACF will not dissolve wax crystals which have already
formed in the fuel.
Application Information
AMSOIL Cold Flow Improver is specifically
formulated for improving fuel flow, helping maintain
fuel integrity and preventing the clogging of filters
and injectors. It is excellent for use with diesel
fuels, heating oils and kerosene. Two oz. of AMSOIL
Cold Flow Improver treats five gallons of fuel, or
one 16 oz. bottle for 40 gallons. The clear bottles
feature an easy-to-read graduation label for accurate
dispensing, helping ensure proper treat ratios.
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