If the vehicle is used mainly in any of the following particularly harsh conditions:- towing a trailer or caravan;- dusty roads;- short, repeated journeys (less than 7-8 Km) and at sub-zero outdoor temperatures;- engine often idling or driving long distances at low speed (e.g. taxi or door to door deliveries) or long period of idleness.- urban routes.The folowing checks must be carried out more often than indicated in the Planned Maintenance Programme:- check front disc brake pad condition and wear;- check cleanliness of bonnet and boot locks, cleanliness and lubrication of linkage;- visually inspect condition of: engine, gearbox, transmission, rigid and flexible pipes (exhaust - fuel system - braking system) rubber elements (boots - hoses - bushes - etc.);- check battery charge and battery fluid level (electrolyte);- visually inspect condition of various drive belts;- check and, if necessary, change engine oil and replace oil filter;- check and, if necessary, replace pollen filter;- check and, if necessary, replace air filter.