The prescribed service interval is based on normal vehicle use. Maintenance work will need to be performed more often than prescribed if the vehicle is operated under arduous operating conditions or increased loads.
regular city driving with frequent intermediate stops
frequent short-distance driving
frequent operation in mountainous terrain or on poor road surfaces
when the engine is often left idling for long periods
operation in particularly dusty conditions and/or if air-recirculation mode is frequently used
In these or similar operating conditions, have the air filter, engine oil and oil filter, for example, replaced more frequently.
If the vehicle is subjected to increased loads, the tyres must be checked more frequently. You can obtain further information at a qualified specialist workshop.