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The NA engines are different from the turbo engines with regards to the oil pump.
There are at least three different pressure valves which were installed on the oil pumps...
Suggest you read all about them in the 615,616,617na FSM.
There are also ' start up noises' attributed to the 616 which it talks about. Take advantage of the feedback loop the manufacturer is in and may have already mentioned in the MB Maintenance manual for your car and year. It is a formal display of all the ' Technical Service Bulletins ' published when changes to the FSM need to be distributed. They are numbered so they fit the original FSM numbering system.. so they can be cut out and inserted in your copy of the original FSM.
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