Compression Ignition Addict
Join Date: Dec 2011
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I was just like you and I was told that it does it bc the engines were built so that when it gets heated up to running temps while driving(under load) that parts expand and seal like they are suppose to.
Don't know if that is exactly correct but I believe its close.
And I also didn't notice mine till after my egr delete.
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2008 F250 6.4 crew cab lariat w/s&b intake, flo pro egr delete, diamond eye 4" turbo back, and mini max