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Old Mar 03, 2012, 02:51 PM
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engine-a-holic
Portugal, Lisboa, Amadora
Joined Jun 2007
325 Posts
Aluminium to aluminium rubbing on a small level makes a dark residue when mixed with a liquid, wether oil, water or grease.
Try running some 600/1000 grit wet sandpaper on aluminium with some oil. Youl see it getting a very dark grey coulour.

Are you using a gasket on the pipe header?
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