I picked up a '19 Z06 this spring and I've put on about 800km since I bought it. My heart skipped a beat when I noticed an oil puddle under my diff today. So up on my lift the car went and I noticed that the leak was coming from the fill plug. I used a small 1/4 pivoting rachet with a 3/8 adapter to get onto the plug.....and it was LOOSE! So loose that I could move the plug with my fingers. Have any of you had a fill plug on the C7 loosen up on you? I know the dealer changed the fluid as per my request so is it possible that the plug backed off over 800km or, more likely, wasn't tightened properly??? Previous to this I've taken several 100/150 km trips without any evidence of leaking....until now. I'm going to top the diff up, tighten down the plug, and just monitor the situation but I was wondering if this has happened to anyone before. Perhaps the plug gasket needs to be replaced??? Thanks.