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When the system in the cluster says it is time.
SAE 5w40 full synthetic oil.
The engine oil is overfilled.
Disconnect the battery for at least several minutes. That should clear all codes in memory
8.5 Quarts
Every77000 KM
3000 miles
The engine holds five quarts of oil with filter change.
Check the wiring for the oil sensor. It is located by the oil filter, and could have been pulled loos during the change.
i dont think there is one. Correct, there isn't one. On this Mercedes engine there is only an oil level sensor in the oil pan.
Pressure switch on a 2005 Chrysler 300 C can be changed by removing the wires from the switch. Remove the retaining nut. Reverse the process to install the new switch.
Bottom of the oil pan.