need for speed? Chip it, custom intake, custom exhaust and thats about it. Theres not alot of aftermarket support for the E23s and E32's it seems.
I got a 186xxx MILES on my motor, just under 300,000km, and its still going strong, heard that around 100,000miles is lke a break in period for the cars.
Let me grab you a link for E32 problems and see if it helps you a little more for your E23.
http://tridem.han-solo.net/auto/eric...e/kaufheng.htm