need advise on buying 1993 300d

there is a 93 300d that i can buy for between 8000.00 & $9000.00
the car has 140,000 miles on it,2nd owner,car has early records,but the current owner did not do maint by the book,he just fixed things as they came up!
does this seem like a fair price for the car and what can i expect in repairs? my worry is that it might be a money pit!
please advise
thanks in advance
eek