Running a diesel purge at open throttle seems to have surfaced a few issues. First the injector return hoses burst open and had to be replaced. Now I have found this residue in the engine bay (valve cover and pictured hose mainly).

The radiator took a liter of distilled water before it filled to the top of the filler on a warm engine - it had zero oil residue floating on the surface. The engine oil on the dipstick also looked normal. No oil leaks anywhere and zero oil consumption.

The car has its original Behr radiator and severely rusted oil cooler. I plan to have the radiator re-cored. I suspect the pictured hose may be leaking. Diagnosis/ thoughts are welcome. Thanks!

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