They are primarily in the intake runners for cylinders 1, 4, 5, and 8.

They are black, and very sticky. If you look into the ports on the intake manifold, it looks like the deposits were splattered into the runner from the head ports. If you look into the head ports they look like they were splattered from the intake manifold.

Its like old grease, but very sticky. Engine oil still looks new, and theres no sludge buildup anywhere.

Any ideas what this could be?

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