if the oil feed pipe has, at any point, been bent and creased.

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.a very easy thing to do if removing a turbo for the first time.

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.it will leak forever, also possible to get a tiny split in the same pipe if it has been bent around on the re-fit.

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.new gaskets wouldn't solve it if this were the prob.

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.I had metal ones in mine when I sorted it and didn't have a prob thereafter.
