Question about Mercedes-Benz 300-Class

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I have a continuous engine oil leak from the desiel engine of my Merc 320 saloon nobody can pinpoin. Any ideas?

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Wash the engine and after it's dry, park over some cardboard. look for the area of the leak to start narrowing it down.
Once you figure out what area the leak is roughly coming from, jack the car up and have a closer look.

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