130k miles a across 2 vans, with current one reaching 70k literally 0 issues with turbo or anything else serious.
Most serious issue was the exhaust slipping the rear hanger and burning the wiring harness on the rear axle.
After a bit of back and forth mercedes warranty repaired (replaced) that leg of the harness.
The vans have quirks for sure, but reliability of late model NC3V and VS30 vans has been good in my experience.