Thank you very much, Scott. The second paragraph of the text you extracted still leaves me somewhat puzzled, however.

It appears to me to say that even if you used distilled water (no mineral content) and no antifreeze (no abrasives to remove minerals), you still had to add a rust inhibiter/water pump lubricant. Am I misreading this or am I just too dense to understand what is being said?

Appreciate your going to the trouble to dig that out for me.

Upon rereading your post, perhaps the key work here is "rust" which could result even from distilled water. Is that the clue?

__________________
Ted
1979 240D
165,000 miles