Oil leaks

I currently own a 94 E320. In the next few months I want to get a '00-'02 E430. I had 3 different MBZ before. They all leaked oil from the timing cain cover and from under the cylinder head. On my current car I ended up replacing a head gasket and sealing the chain cover, which stopped all oil leaks. Did Mercedes finally fix the oil leaks problem or is it still there?
Thanks
Arnie


