Slightly more accurately maybe your fuel pump and fuel filter. - From the look of that fuel filters condition (larger canister) it's time it was changed.
The SLS will have spheres on each side of the rear suspension. If your rear end is bouncing up and down while driving than this is generally a sign that the spheres require replacement.
The valve cover gaskets are cheap.
Sometimes the oil filler cap gasket gets hard and leaks. This also causes oil to be spewed out over the exhaust manifold.