Have you checked for an exhaust leak? That could be causing the grumbling you describe. The exhaust manifolds on the YJ are proned to cracking around the 2-into-1 "Y". as for the oil in the filter, is it the whole filter or just parts of it? The 4.0 tends to spew a little oil from the crank case ventilation hoses that connect to the filter box.
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We're here to help. Also check the usual while you're at it; PCV, vacuum lines (wouldn't want any cracked ones getting worse), plugs, wires, cap, rotor button, fuel filter...etc... Anytime I go into anything on mine I always check the basics before I close it up.
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