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I am pretty sure the hollow tubes you are referring to are the holes designed to allow an allen wrench through the heat exchangers to the allen bolts holding them onto the heads. It seems then that the oil is dropping down onto the heat exchangers and then pouring down through these holes. I guess that's not much help.
Good Luck,
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Buck
'88 Coupe, '87 Cab,
'88 535i sold, '19 GLC 300 DD
Warren Hall, gone but not forgotten
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