Attention! Prolonged skin contact with used engine oil is quite dangerous. Use barrier cream and wear gloves during this procedure. Change oil-soaked clothing immediately.
Note. Regular and frequent engine oil changes are the number one preventive maintenance procedure available to the amateur mechanic. Over time, the oil is susceptible to dilution and contamination, which leads to premature engine wear.
1. Engine oil, if necessary, can be pumped out using a special probe (can usually be borrowed at gas stations) through the probe guide tube.
Attention! Never dispose of used oil down the drain!
2. It is advisable to affix a label to the engine after changing the oil indicating the brand of oil filled in and the date the procedure was performed.
3. The use of oils of various types adversely affects the operation of the engine. Under no circumstances should oils of different brands be mixed. In some situations (especially during the off-season) mixing of motor oils of different viscosities is allowed, provided that they match by type and brand.
Required tool
- Observation pit / flyover / hydraulic lift (if the oil is not pumped out through the top);
- Head for unscrewing the drain plug;
- Special tool for unscrewing the filter (filter wrench, strap wrench or tool HAZET 2172);
- Oil collection tank (if the oil is not being sucked out) with a volume of at least 6 liters.
Necessary spare parts and consumables
- Aluminum or copper sealing washer for the drain plug - sometimes supplied with the oil filter (if the oil is not pumped out through the top);
- Replaceable oil filter;
- The required amount of motor oil approved by Mercedes-Benz.
Draining engine oil
Note. Engine oil can also be removed by suction, using a probe, through the dipstick hole.
1. Warm up the engine to operating temperature (oil temperature +60°C).
2. Jack up the vehicle and place it horizontally on jack stands.
3. Place a container under the oil pan to collect used oil.
4. Remove the drain plug from the oil pan (1) and completely drain the oil - if the drain plug is not placed at the bottom of the engine sump, you should use a special device to pump out the oil.
Attention! If there is a large amount of metal chips and wear products in the used oil, this indicates the presence of scoring, for example, in crankshaft bearings and connecting rod bearings. To prevent damage after the repair, it is necessary to thoroughly clean the oil channels and hoses. In addition, it is necessary, if any, to replace the oil cooler.
Drain plug location (1) sump (2)
5. Then it is necessary to screw in the drain plug with a new sealing ring. Do not exceed the tightening torques specified in the Specifications, otherwise this may lead to leakage and damage.
6. Lower the car on wheels.
Oil filter replacement
Note. See also Sections Maintenance of the lubrication system and Maintenance of the lubrication system.
1. To unscrew the oil filter located on top of the engine, use a special socket wrench.
2. Wipe the mounting flange on the engine block with a rag soaked in fuel, then remove all traces of the old gasket material from its surface.
3. Lubricate the gasket of the replaceable oil filter before installation with a thin layer of impellent oil.
4. The replacement filter, when installed, is hand-tightened until the gasket is attracted to the mounting flange, then another half a turn - see also the information given directly on the filter housing.
5. Make sure that the drain plug is tightened with the required force - do not forget to replace the sealing washer.
Filling with fresh engine oil
Attention! When starting the turbodiesel for the first time after changing the oil, it is necessary to ensure that the engine first runs at idle until the oil pressure warning lamp goes out. Only after reaching the required oil pressure can the gas be increased. If gas is given when the control lamp is on, the turbocharger may be damaged due to insufficient oil.
1. Oil is filled through a special filler neck in the cylinder head cover equipped with a cap.
2. When changing the oil, use new oil of the same type and, if possible, the same brand as that drained from the engine. Use a funnel to minimize splashing. At each oil change, affix a label to the engine indicating the type and grade of oil filled, and the date the change was made.
3. At the first stage, fill in 0.5 liters less oil than indicated in the Specifications, then warm up the engine and, after a few minutes, check the level and, if necessary, make the appropriate adjustment, bringing the level to the MAX mark on the dipstick blade.
Note. Excess oil must be pumped out of the engine to avoid the risk of damaging the engine seals and failure of the catalytic converter.
4. After a test drive, check the tightness of the drain plug and oil filter,
5. After 3 minutes after stopping the engine, measure the oil level again, if necessary, make the appropriate correction.