is also good, they even have advice on Diesels. (might be.org, I forget).
My '85 740 GLE TD is sick -- cannot get it to start. I suspect a blown head gasket since it was rather sudden -- didn't start this winter on a cold day, shouldn't have bothered trying since it gets cranky, and it hasn't gone since.
Had a coolant leak, too, so I may have fried the head.
220,000 something on the odometer.