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i do apologize for the revival, but instead of a new thread: With the above mods, could it be that the engine is getting the required amount of air (air:fuel), subsequently reducing the black smoke (another assumption here) that was experienced before? i ask, because i have a QD32 as well, and...

Possibly due to higher than normal blow-by, causing increased pressure in the crank case, and suddenly you have some oil also moving around in the cylinder head that is pushed through the PCV? i had a ZD30 that had a bit a "sweat" build up in the intake hose - but nothing that would cause...