ok, this is my first time posting. I actually would like to ask everyone for advice. I am looking to buy a 1989 BMW 525i with a 6 in line engine. I am told that it was kept in the garage by a widow after the husband died. The car looks clean inside and out. Leather almost new. It has new tires and a new battery. But, when I drive it, it appears to start rolling slugish until it gets going then it appears fine with a audible rumble that I am assuming is typical of the car. It has 135000 miles. I am paying $2,500 for it. Will I be paying high maintanance at this point; smog certification, cooling/heating problems, transmission, suspension, oil or other problems? It appears to run smooth once it is rolling. I can hear a little ticking sounds emanating from the engine. Valve problems? The seller tells me that it might need a tune up because it has sat in the garage for to long. This would be my first BMW. PLEASE ADVISE.