Leak?
 

Found this underneath the car on the garage floor when I backed it out over the weekend. I had a drop there a few weeks ago and wiped it up as I wasn't sure if it was from the car or not. This one is in the same place (as you can see from the previous stain) and just a drop too. It's underneath probably where the rear end is, though I don't see anything under on the car itself...it's a 2014 Z51 with 6800 miles.

https://cimg2.ibsrv.net/gimg/www.cor...0bee907131.jpg


https://cimg3.ibsrv.net/gimg/www.cor...f6ea0217f2.jpg

From the look of the residue on your finger, a grease?? With the high ambient temperatures, a grease can liquefy and drop from a component. Maybe universal joints or residue from assembly during manufacture? Look for evidence where it might be coming from. I would observe over a period of time to determine actual amount and circumstances relating to leak.

It is tacky to the touch.

Looks like gear oil; get the car up in the air and check out the cooling line connections between the cooler and the diff., you might get away with just a little wrenching to fix it :cheers:

M7 or A6? Seems like there were a few cars with gear oil leaking from a weep hole between the manual transmission and the differential because of a defective rear seal on the transmission. there were also some with leaks from the seals on the axle half shafts where they go into the differential.

m7.

What does it smell like? Compare to grease and oil.