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Does anybody think this is a condensation issue or just a faulty batch of steel?
And is it just on the vnt turbos or has anybody had this happen on a wastegate turbo?

I'm just curious as me and friends of mine have had older vag engined cars for a while and I've never come accross this issue.
 

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Maybe the VNT moves more than a wastegate? A wastegate flutters open once the requested psi is reached and just has to open a small door. The TDI has a smaller turbos so the "wastegate" opens relatively early compared to more racy top end power gas engines. Maybe the VNT puts more wear and tear on the vacuum diaphragm.
 
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