Stihl MSA 120 C Instruction Manual page 43

15 Assembling the Chain Saw
Bar and chain oil lubricates and cools the rotating saw chain.
The service life of the chain and guide bar depends on the
quality of the lubricant. It is therefore essential to use only a
specially formulated chain lubricant.
► For automatic and reliable lubrication of the chain and
guide bar, use only an environmentally compatible quality
chain and bar lubricant. STIHL recommends using rapidly
biodegradable STIHL BioPlus.
NOTICE
Biodegradable chain oil must be resistant to aging, since it
will otherwise quickly turn to resin. This results in hard
deposits that are difficult to remove, especially in the area of
the chain drive and chain. It may even cause the oil pump to
seize.
NOTICE
Waste oil does not have the necessary lubricating properties
and is unsuitable for chain lubrication.
15.4.2 Filling the Chain Oil Tank
To fill the chain oil tank:
► Switch off the chain saw, @ 18.2.
► Engage the chain brake, @ 16.1.
► Remove the battery, @ 17.2.
► Position the chain saw on a level surface with the oil filler
cap facing upwards.
► Clean the area around the oil filler cap with a slightly
dampened cloth.
0458-716-8621-C
► Turn the oil filler cap counterclockwise until it can be
removed.
► Remove the oil filler cap and fill the tank with chain oil.
► Take care not to spill chain oil while refilling the tank.
► Do not overfill the tank. Leave approximately 0.5 in.
(13 mm) of air space.
To close the tank:
► Position the oil filler cap on the oil tank filler neck and
press it down while turning it clockwise until it is tight.
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