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It looks like it could be sludge caused by oil and water mixing, but if it is only on the degas cap, I would question that.
Excuse me, I only saw someone standing on a stool working on a gigantic Ford truck, and another with white T shirt with a hat with something red in the background
Mark you the Man, Thank you, more pics came up , all make cence? kinda to tiered to compleate....... the cap with cheeze would be oil to water ratio Head gasket leak ya or ? cap need to look at oil cooler vs degus cap look ? no dout the heads are at fault.