I am checking out a "southern" 1985 300D turbo diesel sedan tomorrow. The car has around 198K miles. Supposed to have all service records, etc. I know it is rust free, but will double check. What mechanical things should I look for other than the obvious, such as oil leaks, etc? I am not that familiar with these cars. I am sure oil leaks on an old diesel is nothing to be too concerned over, but I know my old '84 190D didn't have any at 156K.

Thanks!