ok, so this has likely been asked a million times. I have an ISB 6.7 360HP on a freightliner chassis. It has 360 hours on it, change oil every year at approximately 10000 miles as it is an RV. Has 19000 miles on the engine. All the oil analysis specs came back fine except copper which came back at 105 PPM. No lead or anything else just copper. No baseline because I didn't analyze the first oil change. So what should I be looking for going forward?