TROVERMAN...check the oil pan gasket as well.
My timing cover leak manifested itself as oil loss at the dipstick until repaired, but my now-leaking oil pan gasket leaves telltale signs on the garage floor.
On the M104, the impending head gasket leak usually shows up at the rear of the head...not to be confused with a valve cover leak (which also occurs on some models in the same manner just above the exhaust manifold)...
...bottom line, is, there are a host of leaks that can occur, and some are more imperative to correct than others...like Larry said, clean the engine first, to isolate the source of the leak(s)...
...and 52K sound a bit early in the mileage for a head gasket failure...usually it will occur between 100 and 150K. I'm at 138K on mine and still holding (knock on zebrano)...
