I'm not sure mate, The garage that built/maintained it told me it was the conrod bearings. They took the sump of and checked it out. I think because I caught it early, the damage is minimal. Like I said, I'm no mechanic so i just go with what they tell me. I can give anyone the garage number to give a better explanation of the bearing issue. Also, I cant afford to fix it otherwise I would have, but I needed to get a car quickly for work.