W204 engine oil diesel and petrol

How much oil do you need for the W204?

The volume of oil required for an oil change depending on your MERCEDES-BENZ C-Class Saloon (W204) engine is as follows:

Oils with which OEM approvals are recommended for the MERCEDES-BENZ C-Class Saloon?

For the MERCEDES-BENZ C-Class Saloon (W204), the manufacturer recommends using engine oils with the following approvals: VW 507 00, BMW LONGLIFE-04, VW 504 00, BMW LONGLIFE-01, DEXOS 2

Which motor oil viscosity grades are recommended for the MERCEDES-BENZ C-Class Saloon (W204)?

For the W204, the carmaker recommends using engine oils of the following grades: 5W-30, 10W-40, 5W-40, 15W-40, 0W-30

Which engine oil specifications are recommended for the MERCEDES-BENZ C-Class Saloon (W204)?

For the C-Class Saloon (W204), the manufacturer recommends using engine oils with the following specifications: ACEA C3, ACEA A3/B4, ACEA A5/B5, API SN, ACEA A3/B3

What motor oil should I choose for my C-Class Saloon?

Our top-rated products that suit MERCEDES-BENZ C-Class Saloon (W204) best include:

• Engine oil Mercedes-Benz Genuine Engine Oil 5W-30, 5l
• Engine oil CASTROL EDGE, LL 5W-30, 5l
• Engine oil MANNOL ENERGY 5W-30, 5l, Part Synthetic Oil
• Engine oil OPEL GM 10W-40, 5l, Part Synthetic Oil
• Engine oil MANNOL Longlife, 504/507 5W-30, 5l

When should the wing mirror be replaced in the W204?

The interval for replacement of the wing mirror in the Mercedes W204 is recommended after %WING_MIRROR_REPLACEMENT_INTERVAL_KM% kilometres.

Which wing mirror is suitable for the MERCEDES-BENZ C-Class Saloon (W204): C 180; C 200; C 220; C 230; C 250; C 280; C 300; C 320; C 350; C 63?

What is the price of a wing mirror for the W204?

The wing mirror price for a Mercedes W204 usually falls between £ 13.49 to £ 66.49.

Engine oil for Mercedes-Benz C-Class (W204)

The Mercedes-Benz C-Class (type W204) is considered one of the most reliable vehicles in its class. Nevertheless, the service life of the engine – especially in CGI and CDI variants – depends largely on the correct choice of engine oil and the right amount. In this guide, you will find out which engine oil is suitable for the Mercedes C-Class W204, how much oil is required, and what to look out for when servicing the oil.

How much oil does your Mercedes C-Class W204 need?

The amount of oil required (oil fill level) depends on the specific engine type, cubic capacity, and year of manufacture. Depending on the engine, the oil filling quantity for the Mercedes C-Class W204 ranges between 5.5 and 8.5 litres (including an oil filter change).

Mercedes-Benz C-Class W204 – oil filling quantity table

Note: MB 229.52 is the latest Low SAPS standard approved for BlueTEC diesel engines to protect the SCR (AdBlue) system – if in doubt, you should use MB 229.51 or 229.52 specification oil for all diesels.

Topping up or changing the oil in the C-Class W204 – what makes sense?

In the Mercedes C-Class W204, topping up the engine oil is sufficient if the oil level is just below the MIN mark and the last oil service was not long ago. This frequently occurs with many W204 engines, especially with M271 CGI or OM651 CDI engines. However, owners of CDI models should note that short journeys are less likely to lead to high oil consumption, but rather to dangerous oil dilution (rising oil level due to diesel ingress).

An oil change in the C-Class W204 is necessary in the following circumstances:

• The maintenance interval according to the Assyst Plus service indicator has been reached
• The oil has lost its lubrication properties. In petrol engines, this can be identified by a very dark discoloured fluid, whereas in the CDI black discolouration shortly after an oil change is relatively normal and does not necessarily mean there is a fault
• The oil has become thin due to short journeys or it smells of fuel
• The oil filter needs to be replaced as part of the regular service schedule
• The vehicle has primarily been used for short journeys for a long time

Practical definitions for the Mercedes-Benz W204:

• Top up → only corrects the oil level
• Oil change → complete oil service with fresh oil and new filter

Especially with M271 CGI engines, oil that has been used for too long or diluted by petrol has a direct effect on the timing chain, turbocharger, and camshaft adjusters.

Oil change: costs for the Mercedes C-Class W204

The cost of an oil change on the Mercedes C-Class W204 depends heavily on the engine, the amount of oil, and the MB approval used. An oil change for a C 180 CGI model is significantly cheaper than for a C 63 AMG or C 350 CDI motor which requires up to 8.5 litres of synthetic oil.

Typical guide values:

• Oil change at a garage: approx. £150–£250 incl. branded oil, oil filter, labour, and waste oil disposal
• Oil change with filter: always sensible for the C-Class and usually included in the cost of the service
• DIY oil change: approx. £60–£110, depending on the oil and filter quality and quantity

LongLife oils (specs: MB 229.5 / 229.51) are more expensive, but enable longer change intervals.

How often is an oil change necessary for the Mercedes C-Class W204?

The oil change interval depends on the maintenance concept and usage:

• Fixed service interval: every 15,500 miles (25,000 km) or every 12 months
• Assyst Plus service: flexible interval of up to 15,500 miles or a maximum of 12 months (UK standard).

For Assyst Plus vehicles, the control unit calculates the replacement interval based on factors such as:

• the number of cold starts;
• proportion of short journeys;
• thermal load; and
• your driving profile and environment (city traffic vs. long distance driving).

Practical recommendation for the C-Class W204:

CGI and CDI engines benefit from shorter change intervals, as the turbocharger, timing chain and DPF are heavily dependent on oil. The oil ages more quickly in city traffic, through frequent short journeys, or due to spirited driving.

Practical conclusion:

• CGI engines: change the oil every 10,000 miles, even if the Assyst interval has not yet been reached
• CDI engines with DPF: change the oil every 10,000–12,000 miles at the latest to prevent oil dilution and wear

An early oil change noticeably increases the service life of the engine and reduces the risk of expensive consequential damage in the long term.

Oil consumption of the C-Class W204 – a realistic estimate

A certain amount of oil consumption is normal for design reasons, especially in turbocharged engines. There are clear differences between different engine variants.

Common causes of increased oil consumption:

• Frequent short-distance trips (often leads to oil dilution, which conceals actual oil consumption on the dipstick)
• High engine speeds or a sporty driving style
• Cold outside temperatures
• High mileage (from approx. 100,000 miles), leading to worn seals

According to Mercedes operating instructions, the official tolerance range is up to 0.8 litres per 1,000 km. If consumption suddenly increases or the oil has to be topped up unusually frequently, the engine should be thoroughly inspected (including crankcase ventilation, piston rings, and turbocharger).

Carrying out an oil service on your Mercedes C-Class W204

An oil service can be carried out without special equipment, provided all parts match the engine code exactly.

What you need:

• Engine oil with the required MB approval (MB 229.5, 229.51, or 229.52, oil quantity 5.5–8.5 litres)
• Oil filter suitable for the engine variant
• New gasket for the oil drain plug
• Sealable container for used oil
• Tools: oil filter wrench (often 27mm socket or 74mm cap) and torque wrench

What to note after the oil service:

• Make sure that the engine oil level is correct after a test drive
• Reset the Assyst Plus service indicator
• Dispose of the used oil and filter correctly

A properly performed oil service is crucial for the service life of the turbocharger, timing chain, and bearings, especially in OM651 engines.

Topping up engine oil yourself – summary

• Park the vehicle on level ground, allow the engine to cool down for at least 15 mins
• After parking, wait about 2 to 3 minutes so that the oil can flow back into the oil pan
• Check the oil level with the dipstick
• Only use engine oil with the recommended MB specification
• Top up 0.2–0.5 litres at a time, checking the oil level in between
• Filling point: oil filler neck in the engine compartment (check for oil can symbol)

Where can I buy engine oil for the C-Class W204?

Suitable engine oil is available on the AUTODOC website and in the AUTODOC app. Oil can be selected specifically according to engine, year of manufacture, and required MB approval – matching the results to the oil quantity required.

Which oil brands are the best for the C-Class W204? Selection of the top 5 brands at AUTODOC

FAQ - Frequently asked questions about engine oil and oil changes for the Mercedes C-Class W204