As the title says I am concened as the most recent UOA showed elevated Copper more than Blackstone expected. I went much longer than I ancipated by going 10K miles and now im kicking myself for it. I am relatively new to UOA so I am reaching out for help. What could cause this high copper? Should I be concerned, should I switch oils or put in an additive. I was also wondering if using 15W-40 could be the culprit since its much thicker on cold weather start ups? I am just looking for some guidance since I want this motor to last forever. I went back to 5W-40. By the way the the most recent analysis was with Amsoil extreme duty 15W-40. I have attached my first UOA and the most recent "concerning" UOA.