Special maintenance requirements
Coolant
Have the corrosion inhibitor/antifreeze concentration in the coolant checked before the onset of winter (once a year in countries with high prevailing temperatures). Have the coolant replaced every five years or 100,000 mi (160 000 km).
Dust Filter for Heating/Ventilation Replacement (If Equipped)
The dust filter is replaced during routine maintenance service. The filter element must be replaced with “B” Schedule service or every 18,500 mi (30 000 km) to maintain effectiveness. However, if operating conditions are dusty, these filters should be replaced more fre- quently. A cover in the HVAC unit that can be reached from the passenger foot well provides access to the filter element.
Engine oil change and filter replacement
The recommended oil and filter change interval is based on FSS or 1 year. Please refer to the heading FSS System in this section for a full description of the use and interpretation of symbols in the FSS system. Only use synthetic engine oils, approved to MB 229.3 or MB 229.5, such as Mobil 1 SAE 0W-40. The FSS may not alert for an oil change at the proper interval if an unapproved engine oil is used; engine damage and reduced engine life may result. Information is available from your authorized dealer. The oil filter should always be changed when the oil is changed.
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