Stihl FS 87 - Fuel System; 4-MIX Engine; Mixing fuel; Gasoline and Engine Oil

FS 87, FS 87 R
English
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The STIHL 4-MIX engine features
mixture lubrication and must be run on a
fuel mixture of gasoline and engine oil.
It operates otherwise on the 4-stroke
principle.
The engine requires a mixture of
gasoline and engine oil.
Avoid direct skin contact with and
breathing in of gasoline fumes.
STIHL MotoMix
STIHL recommends using STIHL
MotoMix. This pre-blended fuel is free of
benzene and lead, stands out because
of a high octane rating, and always
provides the proper mixing ratio.
STIHL MotoMix is blended with STIHL
HP Ultra two-stroke engine oil for
maximum engine life.
MotoMix is not available in all markets.
Mixing fuel
Unsuitable fuels or a mixing ratio that
deviates from the specification can lead
to severe engine damage. The engine,
seals, fuel lines and fuel tank may be
damaged if poor quality gasoline or
engine oil is used.
Gasoline
Use only high-quality gasoline with an
octane rating of at least 90 ROC –
leaded or unleaded.
Unleaded gasoline must be used in
machines equipped with a catalytic
converter.
Using multiple tankfuls of leaded
gasoline can substantially reduce the
effectiveness of the catalytic converter.
Gasoline with an alcohol component
exceeding 10% can cause impaired
engine performance in engines with
manually adjustable carburetors and
thus should not be used in these
engines.
Engines with M-Tronic deliver full engine
performance using gasoline with an
alcohol component of up to 25% (E25).
Engine oil
Use only high-quality two-stroke engine
oil – ideally STIHL HP, HP Super or
HP Ultra two-stroke engine oil, as they
are specially engineered for STIHL
engines. HP Ultra ensures maximum
performance and engine life.
The engine oils are not available in all
markets.
Only STIHL two-cycle engine oil 1:50
may be used to produce the fuel mixture
for machines with a catalytic converter.
Mixing ratio
for STIHL two-cycle engine oil 1:50;
1:50 = 1 part oil + 50 parts gasoline
4-MIX Engine Fuel