I don't see why this inhal person harps on the Z4. Strange that he demands what he and his alter ego fail to provide over and over.
Just for kicks, I asked the owner if he would give all the info wanted.
He said if they posted a nice letter apologizing for their attitude, and explain why, in detail, they need all this information, he'll consider it.
But, given the fact that one knows very little about oil, and the other isn't even savy enough to stay on topic, plus the overwhelming fact that neither have as yet proven a need to know, he is doubtful.