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W116 (1972-1980, petrol) W126 (1979-1991, petrol) W140 (1991-1998) W220 (1998-2005)

Vehicle Maintenance Mercedes S-Class (W140)

Ongoing maintenance — general information
Introduction This chapter has been written to help the hobby mechanic keep his vehicle at peak performance, economy, safety and reliability. Further in the Chapter you...

Maintenance Specifications
Recommended lubricants and fluids Attention! Keep children away from operational materials - if they enter the body of a child, immediately consult a doctor! Note. Only...

Active Scheduled Maintenance Alert System (ASSYST)
Scheduled maintenance indicator (THAT) Note. The scheduled maintenance due date indicator informs about the OPTIMAL maintenance period and its readings are not related...

Schedule of ongoing maintenance
The suggested recommendations assume that the owner performs the vehicle maintenance procedures independently, as opposed to the work performed at the service station of...

General setup information
Term «setting» is used in this manual to refer to a set of procedures rather than a single procedure. If the routine maintenance schedule is strictly adhered to from the...

Checking fluid levels, leak control
Note. The procedures for checking the fluid level are described below, carried out every 400 km or weekly. A description of other fluid level checks can be found later...

Checking the condition of tires and their pressure, designation of tires and wheel rims, wheel rotation
Attention! On S420 and S500 models, tires with a summer tread pattern may only be used on light alloy rims, tires with a winter tread pattern on light alloy and steel...

Changing the engine oil and oil filter
Attention! Prolonged skin contact with used engine oil is quite dangerous. Use barrier cream and wear gloves during this procedure. Change oil-soaked clothing...

Checking the brake system
Warning! Dust resulting from wear on the linings and accumulating on brake components may contain asbestos that is hazardous to health. Do not blow this dust out with...

Checking the fuel system, replacing the fuel filter
Warning! Gasoline is highly flammable, so special precautions must be taken when working on any component of the fuel system. Do not smoke, and do not approach the work...

Checking the condition and replacing the engine compartment hoses, localizing leaks
Attention! The replacement of the air conditioning system hoses should be carried out at a representative service station or a specialist workshop that has the equipment...

Checking the condition of the ribbed belts of the serpentine drive of auxiliary units
Checking the serpentine drive belt of auxiliary units Schemes for laying the belt of the serpentine drive of auxiliary units Serpentine accessory drive belt routing...

Checking the functioning of the cooling system and frost resistance of the coolant, changing the fluid
Note. See also Section materials Checking the condition and replacing the engine compartment hoses, localizing leaks . Many serious engine malfunctions are related to...

Check of a condition of system of release of the fulfilled gases
The check should be carried out with a cold engine, so it is best to do it before the first trip of the day or no earlier than three hours after turning off the engine....

Checking the ATF level, replacing the AT filter
Level check Checking the Fluid Level in an Automatic Transmission 6 - Liquid level indicator 6a - Locking lever 6b - Rod (upper left illustration for models before 09.93...

Visual check of tightness of automatic transmission
Note. Oil in AT does not need to be changed during the entire period of operation. The most likely places for ATF leaks to develop include the following: The plane of...

Checking the Condition of Suspension and Steering Components
Note. Steering and suspension components should be checked regularly. Worn or damaged suspension and steering components can cause excessive and dangerous tire wear,...

Check of a condition of protective covers of power shafts
Protective covers of drive shafts are very important elements, because. they protect the constant velocity joints (SHRUS) against dirt, water and other foreign objects...

Checking the air conditioning system
Attention! The air conditioning system is under high pressure. Do not attempt to loosen any connections or remove parts of the system without first discharging the...

Lubrication of door stops and lock cylinders
Periodically lubricate door stops and hinges with Optimol-Optitemp TT 1. Lubricate the door lock cylinders. Insert and remove the key several times.

Visual inspection of the seat belt and airbag unit
1. Pull out the seat belt fully and check the webbing for broken threads. 2. Damage can be caused by, for example, a pinched belt or exposure to a burning cigarette. In...

Checking the headlights and horn
1. Turn on the ignition and check the operation of all external lighting devices. 2. With the help of an assistant or by driving the car in reverse against a wall, check...

Check of a condition, adjustment and replacement of brushes of screen wipers
Checking the condition of the brushes and the initial position of the wiper arm Tool for checking the initial position of the wiper arm 1 key 2 - Wiper arm 3 - Locking...

Battery check, care and charging
Attention! Please also refer to chapter Engine electrical equipment Attention! The intended service life of the battery is only achieved if it is always sufficiently...

Cabin filter replacement
Note. Replacement made in the cabin filter must be carried out in accordance with the above Schedule of ongoing maintenance Replacing the dust filter of the heater /...

Brake Fluid Replacement
Attention! Do not reuse used brake fluid! Old brake fluid is much darker than fresh. This makes them easy to distinguish. Attention! Do not dispose of brake fluid with...

Checking and replacing spark plugs, checking the condition of high-voltage wires
Note. See also Section Spark plug Chapters Engine electrical equipment . Attention! Replace spark plugs only when the engine is cold or slightly warm. If the spark plugs...

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W140 (1991-1998)

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