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Re: Engine knock (code 304)
It's quite normal for that area to be oily ... and yes, the oil will break down the rubber on the original design isolator bolts. (All that oil is the result of a very effective PCV system ... its keeping the inside of your crankcase clean of piston blow-by ... don't fight it.... as some do!)
How are the EGR ports? Surely a couple, or more, are plugged!
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