I have an 01 1.8T Sports NB. It is at about 138k miles. I bought it used at 121k from a small dealer. It only had one owner before me. I did not get any service records or anything from the guy cause I never got a chance to speak to him. I know at high mileage service is needed, but I do not know what exactly. How can I tell if the guy before me serviced it? & what should have been serviced?