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As a rule, we realise that our car engine has started malfunctioning when we see certain signals on the dashboard, hear some uneven sound during operation of the engine, notice an unusual colour of exhaust gases, find metal chips in the engine oil or notice smoke coming from the engine. These indications may be accompanied by additional ones, such as jerky or stalling operation of the engine or problems with its starting. All these indications may be a consequence of reduced compression or warn parts.