|
NOTE: TABLE IS BASED ON A FUEL OIL
VISCOSITY OF 3.0 AT 40°C This
tabulation may be used to determine the approximate percentage of fuel
oil contained in a sample of used diesel engine lubricating oil if the
kinematic centistoke viscosity at 40° C of the used oil and of the oil
when new is known. To use this
chart, pick the column headed by the viscosity nearest that of the new
oil. in that column, find the viscosity nearest that of the used oil
sample, and in the same horizontal line, in the outside columns (headed
"fuel oil dilution") is given the percentage of fuel dilution.
Viscosity of the used oil sample may be
determined in the laboratory by a standard kinematic viscosimeter, or it
may be obtained with sufficient accuracy by the use of a portable
viscosimeter such as the Visgage. The viscosity of the oil when new may
be obtained in the same way, or taken from the supplier's specification.
Example:
a sample of used oil is found to have viscosity of 137 CST. at 40°C. the
oil when new had a viscosity of 160 CST. at 40° C. in the column headed
by 160 CST., a viscosity of 137 CST. lies in the horizontal line
corresponding to a fuel dilution of three percent. | 
