Tire rotation: Question and observation

[foghorn23]

Just a quick question for everyone, did my first tire rotation this morning.  Couldn't find it anywhere in the manual, but is the wheel torque setting 140 ft./lbs?  Every fullsize GM truck I've owned in the past 20 years has been, but my search turned up nothing.

 

Also there was a substance on the wheel lugs I have never seen on any of my previous Silverado/Sierra trucks. Something like a plastic that had apparently been brushed on the lugs and dried.  One such piece fell off.  See picture below.  What in the world is this stuff?  When I'd start the lug nut back on the lug it made for some resistance.  Had to be careful and make sure I wasn't cross threading.

[redwngr]

2020 Sierra OM has wheel nut torque in last part of the capacities and specs section,  just before the section titled engine specs.

(Page 461)

 

As you suspected 140 ft-lb  / 190 Nm 

 

 

Can't help with the material in the pic

[foghorn23]

Thanks Redwngr.  140 was what I put them to.  Old intuition said that was correct .  Some of the stuff was rubbery and this piece had dried out.  Didn't seem to hurt anything, but I've never seen it before.  To my knowledge wheels have never been off until today since leaving the factory.

[OnTheReel]

I wondered what it was too when I first saw it. Link explains it.

 

https://gm-techlink.com/?p=11020

[foghorn23]

Thanks OnTheReel,  Glad to know I wasn't going crazy.  Not so sure how durable it will be though.  A lot of it flaked off after the first rotation.  Thanks for the info.