Hi all, During 2 engine oil changes ago (at 51K miles) i noticed a drop of oil residue on the backside of the engine block above the oil pan. It is dark brown and feels like engine oil. I wiped it clean for further observation. During the last oil change 1 week ago at 56K miles, the same spot is again wet with oil. See pictures #1 and #2. I wiped it clean and drove for 4 days then raised the car and checked again. Same thing-a drop of engine oil is hanging on the same spot, see picture #3. This leads me to think there is an oil leak in that area. I don't know where the leak is from, can someone help to identify potential sources? The camera is facing up from under the car. BTW there is oil residue on the other side of the "big metal block" as well. During all this time the leak has never accumulated enough to leave spots on pavement. I did all oil changes on my own. I have not dripped oil when filling on top. The location of the oil leak is above oil filter and oil pan, so it couldn't come from either places. Facing foward with the front of the car, the oil residue is on passenger side, directly above the backend of oil pan, on the backside of the engine to the right of the exhaust manifold heat shield which is visible in picture #1. When looking up from under the car directly past the oil spot, the windshield wiper cowel is in the way so it's not possible to spot the leak from above. Can someone identify the source of the leak based on the pictures? Is this serious and do I need to take it to the dealer? A second question: in the last picture (#4), does it look like a cracked engine block? I took this picture in the vincinity of the oil leak while inspecting with a reflecting mirror. The "cracked" location is below the aforementioned oil leak. My car is a 07 with 57K miles and always used Mobile 1 5W30 with Toyota filter every 5K miles. I bought the car new and it has never been in any kind of collision. Thanks for any insights anyone can provide!