1989 535i m30 (US model)
Where exactly is the engine block coolant drain plug for a m30 (US model) E34? I've searched and can't find a definitive answer for a m30 engine.
Blair...
It's hard to see, but the the description in the Bentley is about as accurate as it can get. It's a bit high up on the block, if you get under there at the right angle or I guess have the car on a lift you should be able to see a relatively large hex plug oriented sideways. Don't remember the exact size but I feel like it was bigger than the oil plug (17mm).
Plug should be 19mm.