Check to see if oil is seeping past the air flow meter into the air cleaner housing. That would indicate excessive blow by from the PVC system. A trace of oil at the inter-cooler inlet is normal. Be sure to use a dynamic (metal) seal in the turbo rebuild and not a carbon seal which will wear and leak. I use 20W-50 oil since I live in a hot state. Thicker oil tends to leak and be used less.
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