Originally posted by Greg Roles
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one interesting thing - when my car was stock, its had EGR which I removed about 90,000km ago. At the time of removal, I cleaned out the stock manifold of all the sludge.... but without removing teh head from the engine, there was no way to clean out in intake ports, which were just as fouled as the manifold.
Anyway, I had a good peer in there today, and all of the sludge is gone. I guess lots of air, the bit of blowby oil and maybe some water vapour has cleaned it all out over time

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