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Viscosity-Increases
due to thermal degradation or hfo contamination, reduces with diesel oil
contamination, corrective action needed if it increases by 25% from new oil.
Water
content-Corrective action required at 1%
Insoluble
Sediments-basically the result of wear and oxidation, corrective action at 1%
by weight
Ash-a
measure of incombustible in the oil sample, corrective action at 0.13% by
weight
TAN-Total
acid number consists of the strong acids (mainly sulphuric acid) formed in the
combustion process and weak acids resulting form oxidation of the lub oil.
SAN-Strong
acid number, the oil should be renewed if any is detected
TBN-Total
base number indicates the alkaline reserve particularly important for trunk
piston engines
Closed
flash point-highlights fuel contamination, corrective action if reduces by 30oC
from new
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