Isuzu AU-4LE1T, Maintenance Manual

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(3) Engine Oil Additives
Engine oils contain a variety of additives. Your engine should not
need any extra additives if you use the recommended oil quality and
change intervals.
(4) Used Oil Disposal
Do not dispose of used engine oil (or any other oil) in a careless
manner such as pouring it on the ground, into sewers, or into streams
or bodies of water. Instead, recycle it by taking it to a used oil
collection facility which may be found in your community. If you have
a problem disposing of your used oil, it is suggested that you contact
your dealer or service station.
(This also applies to diesel fuel which is contaminated with water.
See "Diesel Fuel" in Section 3.)
(5) Used Engine Oil
WARNING:
Used engine oil contains harmful contaminants that have
caused skin cancer in laboratory animals. Avoid prolonged
skin contact. Clean skin and nails thoroughly using soap and
water - not mineral oil, fuels, or solvents.
Launder or discard clothing, shoes or rags containing used
engine oil.
Discard used engine oil and other oils properly.