Please check your oil and water levels on a regular bassis.I have just had a GT in my garage this evening with a rattle.The big ends are banging like no-ones business.The car needed 2.5 litres of oil to bring it up to the level.It only takes 2 minutes to check the levels when the car is cold and it is much easier to top up the oil than to do a rebuild not to mention the cost.If you don't know how to check the levels then ask someone who knows to show you.