FIELD: engine building.
SUBSTANCE: invention relates to reduction in premature ignition of fuel in internal combustion engines. The use of an unleaded petrol fuel composition is proposed for reduction in frequency of low-speed premature ignition (hereinafter – LSPI) in an internal combustion engine with spark ignition, where the fuel composition contains petrol base fuel and a package of detergent additives, which contains a mixture of Manniche detergent bases, where the first component is Manniche detergent base obtained from di- or polyamine, and the second component is Manniche detergent base obtained from monoamine, wherein the mass ratio of the first base to the second base is from 1:6 to 3:1, and the internal combustion engine with spark ignition is lubricated with a lubricating composition containing from 1200 to 3000 wt. ppm of calcium per the total weight of the lubricating composition. The use of an unleaded petrol fuel composition for reduction in frequency of LSPI, and a method for reduction in frequency of LSPI in an internal combustion engine are also proposed.
EFFECT: reduction in cases of premature ignition at low speeds in an engine by 5% or more.
12 cl, 1 tbl, 1 ex
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