Fuels

To operate your petrol tool, you need a mixture of petrol and engine oil to power the engine.

Fuel mixture

Your petrol-powered engine requires a mixture of petrol and engine oil. The quality of the petrol and oil is extremely important to the running and life of the engine.

Unsuitable fuels or mix ratios that do not comply with the specification can seriously damage the engine (piston seizing, excessive wear.)

We recommend the following mix ratios:

for STIHL 1 : 50 two-stroke engine oil:
1 : 50 => 1 part oil + 50 parts petrol

For other high-quality two-stroke engine oil with the TC classification:
1 : 25 => 1 part oil + 25 parts petrol

Examples of mixing proportions

Mixing ratios

For a mixing ratio of 1 : 50 you need 5 litres of petrol and 0.10 litres (100cm³) of STIHL two-stroke oil.

Petrol quantity	STIHL two-stroke oil 1:50		Other brand name two-stroke engine oils 1:25
Litres	Litres	cm³	Litres	cm³
1	0.02	(20)	(40)	0.04
5	0.10	(100)	(200)	0.20
10	0.20	(200)	(400)	0.40
15	0.30	(300)	(600)	0.60
20	0.40	(400)	(800)	0.80
25	0.50	(500)	(1000)	1.00

Information about petrol

Always use high-quality petrol with a minimum octane number of 90 RON (we recommend using unleaded to protect your health and the environment).

Caution!

Please note that machines fitted with a catalytic converter must run on unleaded petrol, as otherwise the efficiency of the catalyst may be considerably impaired or the catalytic converter in your machine may actually be damaged.

Information about engine oil

Always use quality two-stroke engine oil complying with the TC classification. It is best to use STIHL two-stroke engine oil which is specially formulated for STIHL engines and helps to prolong engine life.

Important:

The engine, gaskets, fuel lines and fuel tank may be damaged if poor quality engine oil is used.

To mix the fuel, first pour the engine oil and then the petrol into a suitable can approved for use with fuel. Before pouring this mix into the fuel tank, first mix it thoroughly by shaking the can. Take care when opening the can as pressure may have built up inside.