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Originally Posted by TonyFromWestOz
Black oil in the air cleaner or inlet manifold will normally be due to blowby oil vapours.
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in the 92 300D, the blowby goes in after the air cleaner but right before the turbo, so there wouldnt be any in the air cleaner. the black residue in the intake manifold in the US is from the EGR, i dont think you have them in Australia (thank your lucky stars) theres usually ALOT of black goo in the intake manifold from the EGR, thats why people take them off, but in the 92, its complicated.