What year was it made. The 300E was shipped to the US from 1986 to 1993 or so. Many things changed in the emissions systems and the Euro cars were different from the US cars. For the most help, always give all the details about the car. Year, make, model, US/Euro, engine (there were 3.0, 2.6, and 3.2 I believe), trans, etc.
With more information, you may get more responses.
Thanks

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84 500 SEL (307,xxx miles)