Oil leak how check after new oil line replaced
 

Fourth time mentioned dealership, still leak oil I don't know oil pan, gasket, or inside engine I keep losing oil after oil change.

You may want to see if the valve cover gasket and pcv valve are ok. My 2014 Cruze was losing oil and the bottom of the crankcase was wet with it. with the engine running, loosen the oil filler cap and listen to see if the engine runs rougher. That is a sign of a clogged or defective pcv valve. Their is also a GM credit available for the repair. You need to have the repair done, then claim the credit.