I got my 91 525ia and try to replace coolant myself for the first time. From Bentley's and Bruno's web site, there are 2 drain plugs, one under radiator and one at the rear of the engine block. The radiator drain plug seems easy to access. But I am unable to reach the engine block drain plug. Honestly, I am not exactly sure where the 19mm drain plug is. Anyone has a picture or drawing to show the plug? Or I have to go under the car to access it?

By the way, I live in Phoenix, AZ. Is 0W40 oil (recommended by the BMW board) is too thin for the car in the hot climate? Also any good private BMW shops in Phoenix/Scottsdale AZ area?

Thanks,

Jerry (91 525ia)