Vehicle Maintenance Mercedes S-Class (W140)

Routine Maintenance — General Information
Introduction This Chapter has been compiled to help the amateur mechanic maintain his vehicle in a state of maximum performance, economy, safety and reliability. Later...

Maintenance Specifications
Recommended lubricants and fluids Attention! Do not allow children to access operating materials - if they enter the child's body, immediately consult a doctor! Note....

Active Maintenance Warning System (ASSYST)
Scheduled maintenance (MOT) due date indicator Note: The scheduled maintenance indicator informs about the OPTIMAL time for performing maintenance and its readings are...

Schedule of current maintenance
The suggested recommendations assume that the vehicle is serviced by the owner himself, as opposed to work performed at a Mercedes-Benz dealership service station....

General information about the setup
The term "setup" is used in this manual to refer to a set of procedures rather than to a single procedure. If the routine maintenance schedule is strictly followed from...

Checking fluid levels, leak control
Note. The following procedures are used to check the liquid level every 400 km or weekly. Other fluid level checks can be described later in the Sections on specific...

Checking the condition of tires and their pressure, designating tires and wheel rims, rotating wheels
Please note! On the S420 and S500 models, summer tread pattern tyres may only be used on light alloy wheels, while winter tread pattern tyres may only be used on light...

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

Checking the brake system
Warning! Dust from lining wear that accumulates on brake components may contain asbestos, which is hazardous to health. Do not blow out this dust with compressed air or...

Checking the fuel system, replacing the fuel filter
Warning: Gasoline is highly flammable, so special precautions must be taken when working with any fuel system components. Do not smoke or approach the work area with an...

Checking the condition and replacing engine compartment hoses, localizing leaks
Warning! Air conditioning hoses must be replaced at a dealership service station or a specialist workshop equipped to safely relieve system pressure. Never disconnect...

Checking the condition of the ribbed belts of the serpentine drive of auxiliary units
Checking the serpentine belt of auxiliary units Serpentine belt routing diagrams for auxiliary units Serpentine Belt Routing Diagram for Auxiliary Drive on S280 and S320...

Checking the functioning of the cooling system and frost resistance of the coolant, replacing the liquid
Note: Please also refer to the materials in the Section Checking the condition and replacing engine compartment hoses, localizing leaks . Many serious engine...

Checking the condition of the exhaust system
The check should be done with a cold engine, so it is best to do it before the first trip of the day or no sooner than three hours after the engine has been turned off....

Checking ATF level, replacing AT filter
Checking the level Checking the Automatic Transmission Fluid Level 6 — Liquid level indicator 6a - Locking lever 6b - Rod (top left illustration for models produced...

Visual inspection of automatic transmission for leaks
Note: The oil in the automatic transmission does not need to be changed during the entire service life. The most likely locations for ATF leaks include the following:...

Checking the condition of suspension and steering components
Note: Steering and suspension components should be inspected regularly. Worn or damaged steering and suspension components can cause excessive and dangerous tire wear,...

Checking the condition of the protective covers of the drive shafts
Protective covers of drive shafts are very important elements, as they protect constant velocity joints (CV joints) from dirt, water and other foreign objects that cause...

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

Lubrication of door stops and lock cylinders
Periodically lubricate door stops and hinges with Optimol-Optitemp TT 1 lubricant. 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 completely and check the webbing for damaged threads. 2. Damage may be caused by, for example, a pinched belt or exposure to a burning...

Checking the functionality of headlights and horn
1. Turn on the ignition and check the functionality of all external lighting devices. 2. With the help of an assistant or by backing the car up to a wall, check the...

Checking the condition, adjusting and replacing windshield wipers
Checking the condition of the brushes and the initial position of the wiper arm Tool for checking the initial position of the windshield wiper arm 1 - Key 2 — Windscreen...

Checking battery condition, care and charging
Attention! Please also refer to the materials of the Chapter Engine electrical equipment Attention! The intended service life of the battery is only achieved if it is...

Replacing the cabin filter
Note: Replacement of the cabin filter must be carried out in accordance with the above Schedule of current maintenance Replacing the heater/ventilation dust filter (the...

Replacing brake fluid
Warning! Do not reuse used brake fluid! Old brake fluid is significantly darker than fresh. This makes it easy to distinguish between them. Warning! Do not dispose of...

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

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TEXTHTMLBB Code

W140 (1991-1998)