[Dancake]

The only additive I've ever found that works is Forte Diesel Turbo cleaner. It really does make a difference, though a few applications may be needed depending on the severity of the problem. We're assuming that every other cause of ECM-6805 has been discounted, and that the fault actually is the vanes. Good long runs with frequent full range throttle movements seems to keep ECM-6805 at bay.