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Chain Lubricant
For automatic and reliable lubrication of the chain and guide bar – use only an environmentally compatible quality chain and bar lubricant. Rapidly biodegradable STIHL Bioplus is recommended.
Biological chain oil must be 
resistant to aging (e.g. STIHL
Bioplus) 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, clutch and chain. It may even cause the oil pump to seize.
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.
Do not use waste oil. Renewed contact with waste oil can cause skin cancer. Moreover, waste oil is environmentally harmful.
Waste oil does not have the necessary lubricating properties and is unsuitable for chain lubrication.
30
Filling Chain Oil Tank
Preparations
001BA158 KN
NThoroughly clean the oil filler cap and the area around it to ensure that no dirt falls into the tank.
NPosition the machine so that the filler cap is facing up.
NOpen the filler cap.
Filling chain oil tank
NRefill the chain oil tank every time you refuel.
Take care not to spill chain oil while refilling and do not overfill the tank.
NClose the filler cap.
There must still be a small amount of oil in the oil tank when the fuel tank is empty.
If the oil level in the tank does not go down, the reason may be a fault in the oil supply system: Check chain lubrication, clean the oilways, contact your dealer
for assistance if necessary STIHL recommends that you have servicing and repair work carried out exclusively by an authorized STIHL servicing dealer.
MS 170, MS 170 C, MS 180, MS 180 C