In the pic of the Fuel Supply/Lfit Pump #1 is a little O-ring. If that leaks bad enough it is possible for Fuel to get out and into the Oil.
I do not know what the New Engines look like. But, someone with a Newer Engine had their Fuel Return leaking and the Way the Injectors were installed through the Valve Cover with some sort of Tube with Seals on it the Fuel Return leak was pooling in the Tubes and leaking past the old Seals on the Tubes and into the Engine.
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84 300D, 82 Volvo 244Gl Diesel
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