Eric, I have no idea how much oil flow or pressure is in the return oil line. While I had my 1995 E320 in for state inspection I pointed out the leak to a tech and he told me the function of the line. Previously I had looked unsuccessfully at various aftermarket websites for that particular hose/line.

You might try calling your local MB dealer and see if a Service Advisor/Supervisor can provide some detailed information and pointers.

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Fred Hoelzle