Isuzu AU-4LE1T, Maintenance Manual

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CAUTION:
Fungus or bacteria can cause fuel system damage by
plugging the fuel lines, fuel filters or injector. They can also
cause fuel system corrosion.
If fungus or bacteria has caused fuel system problems, you should
have your authorized dealer correct these problems. Then, use a
diesel fuel biocide to sterilize the fuel system (follow the biocide
manufacturer’s instructions). Biocides are available from your dealer,
service stations, parts stores and other automotive places. See your
authorized dealer for advice on using biocides in your area and for
recommendations on which biocides you should use.
(8) Smoke Suppressants
Because of extensive testing of treated fuel versus untreated fuel, the
use of a smoke suppressant additive is not recommended because of
the greater possibility of stuck rings and valve failure, resulting from
excessive ash deposits.
2. LUBRICANT
The quality of engine oil may largely affect engine performance, startability
and engine life.
CAUTION:
Use of unsuitable engine oil will result in piston ring, piston and
cylinder seizure and accelerate the sliding surface wear
causing increased oil consumption, lowered output and, finally
engine failure. To avoid this, use the specified engine oil.