The Mercedes-Benz M110 engine, a robust and well-regarded inline-six produced from the early 1970s to the mid-1980s, powered various classic Mercedes models. Known for its durability and performance, this engine still requires regular maintenance to ensure longevity. One of the most important routine tasks is changing the engine oil and filter at proper intervals. Over time, oil deteriorates, losing its lubricating properties and losing its lubricating properties and accumulating
Production: 1972–1986
contaminants that can lead to increased wear. This guide provides a step-by-step process for correctly replacing the oil and filter in the M110 engine, helping classic Mercedes owners keep their vehicles running smoothly.
Specified SAE viscosity classes during continuous ambient temperatures
Following the SAE grades exactly according to the ambient air temperatures would result in frequent engine oil changes. The temperature ranges for the SAE grades should therefore be regarded as a guideline that may be exceeded for brief periods.
Oil capacity in liters
Oil dipstick color code
Pink Burgundy
Yellow/Green
Total capacity during oil and filter change
6.5
6.0
Oil pan
6.0
5.5
Torque specifications (Nm)
Oil pan drain plug
Center bolt, oil filter cover
40
35
Special Tools:
- Suction engine oil via an oil dipstick tube with the engine at operating temperature.
If no suction unit is available:
- Drain engine oil from the oil pan (arrow).
- Unscrew and empty the oil filter lower half (3).
- Wash and blow out the oil filter’s lower half.
- Check the sealing ring (2) and replace it as necessary.
- For this purpose, pull the compression spring together with the spring retainer (5) off the fastening screw (1). Make sure that the compression spring and retainer is correctly installed during assembly.
- Replace rubber sealing ring (4).
- Install oil filter lower half with a new filter element (6) and torque fastening screw (1) to 35 Nm.
- If oil has been drained from the oil pan, replace the sealing ring on the drain plug.
- Torque oil drain plug to 40 Nm.
- Add engine oil.
- Run the engine and check for leaks.
- Check oil level approx. 2 min. after stopping the engine at operating temperature.
Routine oil and filter changes are essential for maintaining the performance and longevity of the Mercedes-Benz M110 engine. As a classic engine, it requires clean, high-quality oil to prevent wear and ensure proper lubrication. By following the correct procedure—draining the old oil, replacing the filter, refilling with the recommended oil, and checking for leaks — owners can preserve engine reliability. Proper disposal of used oil and filters is also important. With consistent maintenance, the M110 engine can continue to deliver smooth performance for many more miles.
