Elevated Copper in UOA's on GM vehicles.

[ryansride2017]

Where does the high copper values come from? Patman recently said (not a direct quote) the copper isn't "bad copper". Isn't copper, regardless or origin, a wear metal? Does having the high concentrations of copper effect the engine?

 

[Al]

There have been a lot of threads on this subject. One theory is antisieze the others are thrust bearing wearand piston pin wear-I believe (I could be wrong here). Based on the number of GM engines which develop a piston slap-I'm not sure anyone can definitely loosing all of this copper is totally benign.