Dear Richard thanks for attempting help.The miles are 49k.There are service tickets.And i was years enough in the car bussiness That I am sure the miles are right I bought it from a private owner.Who works on Capitol Hill he bought it from a congressman who was the original owner.As far as it having been overheated.I cannott say.I did Change the oil over to Mobil one.As I said I only recently got the car.It did not make the noise when I got it.I did send it to a shop to fix a vacumn leak in the climate control.I usually do my on work.But I could not figure out that problem.This car is a play thing Not my main driver.It may have been making this noise as soon as I got it back from the shop.I did not use it for a week or so.So I can not give a definative on that.Thanks again Michael