I'm after information regarding what sounds like a timing chain noise on startup, it only lasts a couple of seconds and then goes and it doesn't always happen. On searching the information I'm reading indicates it could be the oil pump chain, does any one have further info on this. The vehicle has only done 98,000km which is nothing for a diesel. I've just had the vehicle serviced and they ran an engine flush through to help relieve any slug if there is any buildup. If it is the chain, does anyone know roughly what time frame or milage before it can become a real issue.