871 oil mixing with fuel

[Rawze]

Stop guessing, get a sample, send it to a lab and have it tested. That would be my first step if I had a fuel contaminant.

#1 on old engines is asphaltene buildup.

#2 is Algea in the fuel.

#3 something someone may have dumped into the tank.

It would be fairly rare and difficult to get oil (or even soot) in the fuel system. Algea can damage and destroy fuel system components. Nothing to play with, so finding out what it is via a quality lab that can test for all of those things should be first priority.

In the mean time, ensure you are not getting excess crank case pressure buildup or excess blo-by to cause it. One place to look is how new the crank case filter is. a lot of guys drill out the crank case filter to prevent any buildup, as it is bad for the engine and turbocharger too...

This is the maint. free one you can buy...
http://rawze.com/forums/showthread.php?t...50#pid8950

or if you want to drill it out yourself....
http://rawze.com/forums/showthread.php?t...376#pid376

an explanation...
http://rawze.com/forums/showthread.php?t...22#pid9322