Timely oil change is necessary for the perfect operation of the engine.
Selecting oil
Mercedes recommends the following brands of oil for its diesel engines:
1. CCMC-D4, CCMC-D5 and CCMC-PD2. API CE or CF-4 oil grades are used only if CCMC grade oil is not available. It does not matter whether you filled the oil at a station or bought it, one of the recommended oil grades should be indicated on the packaging.
Viscosity. A measure of the oil's lubricating properties. In winter, engine oil should be thin enough to lubricate all necessary components immediately after a cold start. In summer, on the contrary, thick oil is required so that the integrity of the lubricant film is not damaged at high temperatures.
SAE class (Society of Automotive Engineers). Indicates the viscosity class, for example SAE 15W-40. The lower the first number, the less viscous the oil is in the cold ("W" - winter). 0W oil has lubricating properties at -30°C, 5W - at -25°C, and 15W - at -15°C. The higher the second number, the better the oil withstands high temperatures.
ACEA (Association of Constructeurs Europeen d'Automobiles). The European oil standard introduced in 1996. Replaces the CCMC standard. For gasoline engines, there are grades A1 (oil with a small content of purified alcohol), A2 (low additive oil), A3 (high performance oil). For diesel engines there are grades B1, B2 and B3.
SSMS (Committee des Constructeurs d'Automobiles du Marche Commun). The specification includes the letters "G" (gasoline engines) and "PD" (diesel engines), as well as a number. The higher the number, the better the quality of the oil.
API (American Petroleum Institute). The specification consists of the letters "S" (gasoline engines), "WITH" (diesel engines) and others. The further the letter is from the beginning of the alphabet, the higher the quality of the oil.
2. Oils with markings CCMS-G4/ G5 or API SG are designed for petrol engines, so they cannot be used for Mercedes diesel engines. But if the packaging has a double marking, for example CCMS-G4/ PD2, this oil is suitable for both types of engines.
Fig. 4.32. Scale of working ranges of oils
In the European region, with a wide range of winter and summer temperatures, oil of viscosity grade 15W-40 (Fig. 4.32) or 10W-40 can be used throughout the year. Only at very low or high temperatures persisting for a long time should oil of a different viscosity be used.
Engine crankcase ventilation
Engines in good working order pass 50 to 70 liters of exhaust gases per minute through the piston rings into the engine crankcase. These gases must be removed from the engine to avoid creating strong loads on the seals. This is done by crankcase ventilation.
Oil consumption
Some of the oil burns when lubricating the pistons. A well-tuned engine consumes approximately 0.2 l per 1000 km, while Mercedes has a maximum oil consumption of 1.5 l per 1000 km.
High oil consumption
Please note the following circumstances:
1. Before checking oil consumption, you need to make sure that it is not leaking from the engine (visual inspection of the motor).
2. If the oil level is above the maximum mark on the dipstick, then oil consumption will always be higher, since its excess is removed through the ventilation system.
3. Universal oil requires constant checking.
4. A sharp driving style increases the consumption of not only fuel, but also oil, especially when driving at high revs.
5. Oil consumption is always higher during the break-in period of a new car (minimum 5000 km).
6. The engine may be faulty.