Engine build date tag is on the rear of the drivers side cylinder head, can be seen from under the car, ramps will be what you need or jack up the drivers side a bit.
The Julian build date of the engine is in the beginning of the lower number after the first letter and number, mine started with N1.
Engine Build Tag
As for the gas/fuel smell in the oil, when you get a chance, put the transmission in L9 and drive the vehicle on the highway at 65-70 MPH and see if you can "cook" the fuel out of the oil and at least reduce the fuel dilution. As mentioned, in the first 4-10. miles of any of these new vehicles, the engines are not run long enough to warm up the oil. Final assembly start up and test, moving vehicles around in storage for loading on transporters and then delivering to the dealer and moved around on the dealer lot. Short test drive and trip to local gas station to fill the tank. This is not ideal!
