AUXMIKE , my valve cover gasket is fine for both YARIS . When I do oil changes I'm very carefull not to spill oil when pouring it in with a funnel . Do you do your own oil changes ? If not , maybe they spilled some . As for the oil leak , it comes from the exposed black head gasket in the picture you took ( very clear

) . I circled it in RED ( part of exposed gasket is to the left ( black) , rest of it is under the head ) . The ARROW I drew shows that the oil leaks from under the gasket and downward . To check for the oil leak you'll need to reach around to the back of the engine and then run either your index / middle finger (

) under the exposed part of gasket from right to left to gather the any possible oil . If you find oil or a black soot or both you may have the leak . You may want to take some paper towels and window cleaner ( cuts through the grime , oil ) and clean that area thoroughly and then recheck after 100 milles or greater . Then recheck several more times . I suggest you do it when the engine is cold or wait a little while to cool off . Learned my lesson the hard way . Let us know what you find . Hopefully it's fine .