WARNING: This page is about a different car, the 2005 Dodge Stratus and 2005 Chrysler Sebring. However, it is still accessible from the selected car via links, so may be relevant.
Apply engine oil to the camshaft oil seal lip.
Use special tools MB991559 and MD998713 to press-fit the camshaft oil seal.
Fig 1: Applying Engine Oil To Camshaft Oil Seal Lip