Fuel in oil please help part 2

[Unilevers]

the chances of pulling 6 OEM cummins injectors in one batch that leak up through the bodies? No way they may be leaking but there is more to this story something caused them to be like that. Injectors are not in matched sets of 6, they are produced individually and those injectors are probably different lots made many days apart.

Leaking up through the bodies of a common rail injector and into the valve cover is EXTREMELY RARE. 99.99% of the time they just excessively leak into the return. having 6 new ones do this..... see where im going with this.