2006 Mercedes E320 CDI diesel - oil leak - sporadic sometimes size of a dime then 4-5 inches in diameter. changed the o rings and oil separator housing. appears to only leak when parked on a slight incline in driveway - if parked on level ground doesn't appear to leak at all? suggestions?

 

first.. wrong section.. your vehicle is a W211 (the W209 is a CLK)..

second, you have a leak somewhere around the engine and because of the belly pans under the engine, they are holding the oil until you get on a small incline and it drains down to one side or the other and finds one of the drip holes around it. Without a visual inspection, it could be almost anything around the engine.