was changing my oil yesterday and removed the main splash guard and found this 10mm nut rolling around. i tried to look and and think where ive ever seen just a nut being used under the hood and cant think of any of that size. most of the fasteners are bolts. so if anyone can recall where under the hood they ran into a nut let me know. thanks

 

One of the two front flange nuts on the engine cover maybe?

 

naw the 2 lower engine cover nuts have a round top but those are there.