2006 GMC Sierra 2500HD 6.6 TD. Only have 8.1 PSI max @2500 RPM. 1-2 PSI @ idle. Oil residue in tube, black smoke when I accelerate. Thinking I may have a seal leak, or need to replace. Have not broke onto it to ascertain the status of the vanes. Any suggestions would be appreciated, even hints on how to replace, and the best replacement
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