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Fluid level checks Mercedes-Benz E-Class 2002 - 2010 Diesel E270 CDi - 2.7

OnDemand step-by-step maintenance & repair BETA

Mercedes-Benz E-Class 2002 - 2010  | E270 CDi - 2.7 Fluid level checks

  • time 5 to 30 minutes
  • difficulty 1

Underbonnet check points

In-line engine shown - V6 is similar A) Engine oil level dipstick B) Engine oil filler cap C) Coolant expansion tank D) Brake fluid reservoir (unclip the cover for access) E) Screen/headlight washer fluid reservoir F) Power steering fluid reservoir

    Engine oil level

    1 Make sure that your car is on level ground
    2 Check the oil level before the car is driven, or at least 5 minutes after the engine has been switched off.
    If the oil is checked immediately after driving the vehicle, some of the oil will remain in the upper engine components, resulting in an inaccurate reading on the dipstick!

    The correct oil

    3 Modern engines place great demands on their oil. It is very important that the correct oil for your car is used.
    Engine oil grade:
      Models without a diesel particulate filter 5W/30 meeting Mercedes specification 228.3/228.5/228.51/229.3/229.31/229.5/229.51. Eg. Castrol Edge 5W30
      Models with diesel particulate filter 5W/30 meeting Mercedes specification 228.51/229.31/229.51. Eg. Castrol Edge 5W30
    4 If you have to add oil frequently, you should check whether you have any oil leaks. Place some clean paper under the car overnight, and check for stains in the morning. If there are no leaks, the engine may be burning oil.

    Vehicles with an engine oil level dipstick

    5 Always maintain the level between the upper and lower dipstick marks. If the level is too low severe engine damage may occur. Oil seal failure may result if the engine is overfilled by adding too much oil.
    6 On all diesel models it is located on the left-hand rear side of the engine. See “Underbonnet Check Points” for the exact location of the dipstick.
    7 Withdraw the dipstick. Using a clean rag or paper towel, wipe all the oil from the dipstick. Insert the clean dipstick into the tube as far as it will go, then withdraw it again.
    Withdraw the engine oil level dipstick
    8 Note the oil level on the end of the dipstick, which should be between the upper MAX mark and the lower MIN mark.
    The oil level should be between the upper MAX mark and the lower MIN mark
    9 Oil is added through the filler cap on top of the engine. Rotate the cap through a quarter-turn anti-clockwise and withdraw it. Top-up the level. A funnel may help to reduce spillage. Add the oil slowly, checking the level on the dipstick often. Do not overfill.
    Add oil slowly through the filler cap apeture

    Vehicles without an engine oil level dipstick

    10 Some models have a red cap fitted to the dipstick tube, and not a dipstick. The engine oil level is checked on the multi-function display unit on the instrument panel. By pressing the up and down buttons repeatedly, the ENGINE OIL LEVEL, MEASURING NOW! will appear on the display. Follow the instructions shown to achieve the correct level. If you need to renew the oil and filter, click below

    Engine oil and filter change

    Coolant level

    Warning: DO NOT attempt to remove the expansion tank pressure cap when the engine is hot, as there is a very great risk of scalding. Do not leave open containers of coolant about, as it is poisonous.
    11 With a sealed-type cooling system, adding coolant should not be necessary on a regular basis. If frequent topping-up is required, it is likely there is a leak. Check the radiator, all hoses and joint faces for signs of staining or wetness, and rectify as necessary.
    12 It is important that antifreeze is used in the cooling system all year round, not just during the winter months. Don’t top-up with water alone, as the antifreeze will become too diluted.
    Antifreeze type Mercedes Benz Long life coolant to specification M325.6 (refer to the for the latest specifications)
    13 The coolant level varies with the temperature of the engine. When the engine is cold, the coolant level should be level with the marker bar withing the filler neck. When the engine is hot, the level will rise approximately 15 mm.
    14 If topping-up is necessary, wait until the engine is cold, then slowly unscrew the expansion tank filler cap anti-clockwise, to release any pressure in the system, and remove it.
    Unscrew the coolant expansion tank filler cap
    15 Add a mixture of water and antifreeze through the expansion tank filler neck, until the coolant is level with the marker bar in the filler neck. Refit the cap, turning it clockwise as far as it will go until it is secure.
    Add coolant to the expansion tank...
    ...until it is level with the marker bar in the filler neck. Should you need to replace the coolant, click below

    Coolant replacement

    Brake/clutch fluid level

    Warning: Brake fluid can harm your eyes and damage painted surfaces, so use extreme caution when handling and pouring it.
    Caution: Do not use fluid that has been standing open for some time, as it absorbs moisture from the air, which can cause a dangerous loss of braking effectiveness.
    Note: The fluid level in the reservoir will drop slightly as the brake pads wear down, but the fluid level must never be allowed to drop below the “MIN” mark.

    Safety first!

    16 If the reservoir requires repeated topping-up this is an indication of a fluid leak somewhere in the system, which should be investigated immediately.
    17 The brake master cylinder and fluid reservoir are mounted in the engine compartment on the right-hand side of the bulkhead. The MAX and MIN level marks are indicated on the side of the reservoir and the fluid level should be maintained between these marks at all times. The MAX level is also indicated within the filler neck.
    On some models, rotate the fasteners anti-clockwise and remove the cover from above the master cylinder
    On other models, remove the cover over the fluid reservoir
    The MAX and MIN levels are shown on the side of the reservoir
    18 On manual transmission models, the clutch master cylinder is supplied with fluid from the brake master cylinder reservoir.
    19 If topping-up is necessary, wipe the area around the filler cap with a clean rag before removing the cap. It’s a good idea to inspect the reservoir. The fluid should be changed if dirt is visible.
    Wipe around the filler cap
    20 Carefully add fluid, avoiding spilling it on surrounding paintwork. Use only DOT 4 PLus fluid; mixing different types of fluid can cause damage to the system and/or a loss of braking effectiveness. After filling to the correct level, refit the cap securely. Wipe off any spilt fluid.
    Place rags around the filler neck to absorb any spillage

    Screen/headlight washer fluid level

    21 Screenwash additives not only keep the windscreen clean during foul weather, they also prevent the washer system freezing in cold weather - which is when you are likely to need it most. Don’t top up using plain water as the screenwash will become too diluted, and will freeze during cold weather.
    Caution: On no account use coolant antifreeze in the washer system - this could discolour or damage paintwork.
    22 The reservoir for the windscreen and rear window, and healight (where applicable) washer systems is located in the front right-hand corner of the engine compartment. If topping up is necessary, open the cap.
    Open the windscreen/headlight washer fluid reservoir cap
    23 When topping-up the reservoir a screenwash additive should be added in the quantities recommended on the container.
    Top up the screen/headlight washer reservoir. It could also be time to replace the wiper blades. For details, click below
    - Close + Open

    Wiper blade replacement

    Check the condition of the wiper blades. If they are cracked or show any signs of deterioration, or if the glass swept area is smeared, renew them. For maximum clarity of vision, wiper blades should be renewed annually, as a matter of course.

    Front wiper blades

    1 Set the wipers in the
    2 Fold the wiper arms away from the windscreen.
    Caution: Do not attempt to fold the arms away from the windscreen when they at not at the vertical position, otherwise damage to the bonnet may result.
    Position the blade at 90° to the arm...
    . . . and slide it from the arm.

    Rear wiper blade

    Pull the blade away from the screen, rotate it 90°, depress the clip and slide it from the arm.

    Power steering fluid

    24 Before you start:
    Note: For the check to be accurate, the steering must not be turned once the engine has been stopped.
    25 Remove the plastic cover from the top of the engine.
    Undo the fasteners and remove the cover - in-line engines
    Pull the cover up from the rubber mountings - V6 engines
    26 The reservoir is mounted at the left-hand side of the engine compartment.
    Power steering fluid reservoir cap
    27 Wipe clean the area around the filler cap, then unscrew it from the reservoir. The level should be at the MAX mark on the dipstick, depending on the temperature of the fluid.
    MAX and MIN marks on the dipstick are given for 80°C and 20°C
    28 If topping-up is necessary, use the specified type of fluid - do not overfill the reservoir. Take care not to introduce dirt into the system when topping-up. When the level is correct, securely refit the cap.
    Only top up using the specified type of fluid
    Power steering fluid Pentosin hydraulic fluid. MB part No. A 001 989 24 03 10