My son's 2.4 litre suddenly started a major oil leak from behind the timing chain cover. Looks like where the oil pressure passage goes to the chain tensioner. Almost running out, just continuous drips. Is this a common problem or is this unique. I rebuilt the engine less than 20,000KM ago and it runs just fine other than the oil leak. We are going to scrap it as I don't want to bother fixing it again. I was just wondering.