FS 510 C-M, FS 560 C-M
English
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Gasoline with an ethanol content of 
more than 10% can cause running 
problems and major damage in engines 
with a manually adjustable carburetor 
and should not be used in such engines.
Engines equipped with M-Tronic can be 
run on gasoline with an ethanol content 
of up to 25% (E25).
Use only STIHL two-stroke engine oil or 
equivalent high-quality two-stroke air-
cooled engine oils for mixing.
We recommend STIHL 50:1 two-stroke 
engine oil since it is specially formulated 
for use in STIHL engines.
Do not use BIA or TCW (two-stroke 
water cooled) mix oils!
Use only STIHL 50:1 heavy-duty engine 
oil or an equivalent quality two-stroke 
engine oil for the fuel mix in models 
equipped with a catalytic converter.
Take care when handling gasoline. 
Avoid direct contact with the skin and 
avoid inhaling fuel vapour.
The canister should be kept tightly 
closed in order to avoid any moisture 
getting into the mixture.
The fuel tank and the canister in which 
fuel mix is stored should be cleaned 
from time to time.
Fuel mix ratio
Only mix sufficient fuel for a few days 
work, not to exceed 3 months of storage. 
Store in approved safety fuel-canisters 
only. When mixing, pour oil into the 
canister first, and then add gasoline.
Dispose of empty mixing-oil canisters 
only at authorized disposal locations.
Preparations
When fueling on a slope, always position 
the machine with the filler cap facing 
uphill.
N On level ground, position the 
machine so that the filler cap is 
facing up.
N Before fueling, clean the filler cap 
and the area around it to ensure that 
no dirt falls into the tank.
Examples
Gasoline Oil (STIHL 50:1 or equiva-
lent high-quality oils)
liters liters (ml)
10.02(20)
5 0.10 (100)
10 0.20 (200)
15 0.30 (300)
20 0.40 (400)
25 0.50 (500)
Fueling