As above, I doubt it requires a new VANOS system - that sounds very dramatic and expensive.
I put a Wolf sump guard/rubbing plate on mine as the sump plug is incredibly easy to damage - it can even be twisted a little by contact with mud leading to an oil leak... as I found out. The Wolf plate has saved my engine on numerous occasions, well worth it.
Also as others have said, it's worth getting an OBD II diagnostic tool - relatively inexpensive on Amazon and worth it to see what fault codes are being thrown up.
