Fuel in oil.
One of my Blackstone oil analysis reports indicated a "trace" of fuel in the oil. The next report indicated 1.5% fuel in the oil. This alarmed me a bit so I took a sample about 1000 miles later and no fuel was detected. My next regular sample (about 6000 miles) showed just a trace.
The lab determines the fuel dilution indirectly by checking the flash point. I am convinced the 1.5% fuel dilution was a mistake and I never had a problem.
I certainly wouldn't worry about a trace unless it worsens significantly. 
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1996 Dodge 2500 4X4 SC, SLT,Cummins 12V, 5-spd., JRE 4" exh., TST #10, AFC Spring Kit, BD 300-H.P. pump, DDP Stage II Injectors, ATS Exh. Man., 3K G. S., Horton Fan Clutch, Exhaust Brake, SB Con O Clutch, RS9000 Shocks, Combo Gauge, AFE Air Filter, Brite-Box, no turbo silencer ring.
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