I have 165k miles on my 1983 240D, of which I put 70k miles on it. The car has had great care by the orignal owner and continue by me. I do have a couple of quesions that maybe some of you can help me with:

1. When should the timing chain be replaced? Is there a recommended mileage point or will it provide some tell tale signs that it needs replacing?

2. Car is a wonderful city car but on the highway it drive me nuts. At 75mph she feels like she is reving fairly high rpms. This gets old and tiresome on a long trip. The car has an automatic. What are options that can be done to drop the revs besides slowing down? In GA you get run over on most highways if you are no running at least 70 mph.

3. Lastly how hard is it to change the fuel filters. I outsource all my maintenance but do to an algae problem I have had I would like to be able to change the filters on the spot if I have some problems while on the road.

Thanks all in advance for yoru input.