The Mercedes-Benz OM616 and OM617 engines are legendary diesel powerplants known for their durability and longevity. Found in classic Mercedes models from the 1970s through the 1980s, these engines can last for hundreds of thousands of miles with proper maintenance. One of the most critical routine tasks is changing the engine oil and filter at regular intervals.
Diesel engines produce more soot and contaminants than gasoline engines, making frequent oil changes essential to prevent wear and ensure smooth operation. This guide provides a step-by-step process for changing the oil and filter in the OM616 and OM617 engines, helping to keep these classic Mercedes diesels running reliably for years to come.
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.
CAUTION!
SAE 10W single-grade oils must not be used
in engine 617.95.
(86F), SAE 40 can be used.
2) Except Turbodiesel engine 617.95
Oil capacity in liters
Torque specifications (Nm)
Special tools
Due to the different sizes, the filter element and the rubber seal ring on the cap should not be exchanged with those on engines 601, 602, and 603.
Before suctioning or draining engine oil, empty the oil filter. For this purpose, loosen the nuts (arrows) and remove the cover.
Suction engine oil via oil dipstick tube with
engine at operating temperature.
If no suction unit is available:
Drain engine oil from the oil pan (arrow).
Replace filter element.
Replace rubber seal ring (1) on cover.
Check the oil port on the oil tube for foreign
matter (arrow). If it is blocked, remove the
foreign matter by hand. Then blow through the oil port with compressed air; air must noticeably come out of the bottom of the oil tube. If the oil port is not open or if no air comes out, replace the oil filter cap and oil tube.
Tighten nuts to 25 Nm with a torque wrench.
If oil has been drained from the oil pan, replace the seal ring on the drain plug.
Tighten the oil drain plug to 40 Nm.
Add engine oil.
Run the engine and check for leaks.
Check oil approx. 2 min. after stopping the engine at operating temperature.
Regular oil and filter changes are vital for preserving the performance and longevity of the Mercedes-Benz OM616 and OM617 diesel engines. Due to their age and the nature of diesel combustion, using high-quality oil and filters is essential to prevent excessive wear and sludge buildup. By properly draining the old oil, replacing the filter, refilling with the recommended oil, and checking for leaks, owners can maintain optimal engine performance. Additionally, responsible disposal of used oil and filters is important for environmental protection. With consistent maintenance, these classic diesel engines can continue running efficiently for hundreds of thousands of miles.
