Manufacturing Defect

I got the delivery of my Ertiga ZDI in July 2012. Have driven about 1000 Km and now find a patch of oil under the vehicle every morning. Sent the vehicle to the Maruti service station three days back, they open and close the engine but cannot find the root cause. Seems like all is lost. This is happening in deisel dezire/swift/ertiga. Do google to find details from many people.