WARNING: This page is about a different car, the 2008 Mitsubishi Lancer. However, it is still accessible from the selected car via links, so may be relevant.
Use special tool MB991245 to press-fit the oil seal.
Apply multi-purpose grease to the oil seal lip and driveshaft oil seal seating area.
Fig 1: Applying Multi-Purpose Grease To Oil Seal Lip And Driveshaft Oil Seal Seating Area