Does high copper from an oil cooler indicate a need to change oil? Just got my first run of Red Line back and copper was in the 40's. Everything else was exceptional. Now I am 99.9% sure it IS from the oil cooler because I got the oil temps much higher than my last run, causing the cooler stat to open much more often. And this was through summer. last analysis was winter. I don't think it is harmful, but want to make sure. How does it get in the oil? And in what form? I assume it's not particulate if it's not harmful. Why does copper do that? And do different types of oil increase that effect?