I changed oil last week and sent in a sample to Blackstone. I have had a problem with fuel dilution, but it appears to be getting better with every oil change. Do any of you 6.7L guys get your used oil analyzed and/or have a problem with fuel leaking into the crankcase? I use Amsoil DEO synthetic 5W-40 plus a Stratapore filter and would like to extend my oil change interval to 10,000 miles, but I won't do that until the fuel dilution problem goes away.

Link to Blackstone report

If anybody wants to know more about used oil analysis, go to the Blackstone Labs or Amsoil Oil Analyzers websites.