The engine of the 735 is most widely used and generally the " working horse" among the BMW engines. That means that you will have easy access to used parts. The engine is easier to service than the more complicated V12 I have, and there is also much more space in the engine room to do a service. According to the VIN decoder the car was built in 01/1991, Vehicle code GB43. I have no access to carfax.
Go to my link page and click in second section "before buying...."
There is a write up in German and the same one in English.
Does not matter which engine is described there, but the ietms to check or where problems are to be expected are all the same for the E32 model.
click here
On my page there is also a link to the E34 net. Worthwhile to check this one out. There is one good page "what will break". It tells you exactly what to check, because basically the E34 and E32 are same, except the body mainly. But many parts are interchangeable.