I am looking to buy a 91 735i with 200k. I have seen the consumer reports on it and am not sure what the common failure of "heater box" might be or how to check to see if that is a problem in this one. It seems to be a pricey fix and I dont want to get stung. The current owner says the previous owner put in a rebuilt trans so I hope that is a good sign. The owner says the engine is still strong, it has the inline 6. Fully loaded, he is willing to negotiat the price. Ebay doesnt have much but 2500 seems fair to me. Any ideas anyone?