Zetor FORTERRA HSX 120 Operator's Manual page 167

TRACTOR MAINTENANCE
FUEL FOR ZETOR ENGINES WHICH ARE NOT EQUIPPED
WITH DIESEL PARTICLE FILTER
Summer diesel fuel for the period from April 1 to October 31
Winter diesel fuel for the period from November 1 to March 31
Note: Suitable fuel types abroad should be used in a similar way.
Natural Diesel mixed fuel (bio-diesel)
Note: Using bio-fuel in the tractor requires installation of REP hoses in the
fuel system. Using bio-fuel increases consumption, reduces the output by
approx. 5% and requires replacement of the engine oil after 200 hours of
work. It also has an aggressive influence on varnished parts.
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