It is not uncommon for oil leaks to develop from the valve cover gaskets. Replacement of the leaking gaskets will repair this issue.Google+
Car Problem Reports
Mitsubishi Galant Oil leak from valve cover gaskets
Mitsubishi Galant Problem
Engines Affected: 2.4L 4 Cylinder, 3.0L V6
Average Mileage: 121,700 mi (105,800 mi - 146,000 mi)
Visitor, 2003 Mitsubishi Galant, 3.0L V6, 146,000 mi
Grit build up on the engine block, black and kind of sandy.