Oil was in service for ~6.5 months (203 days). Driven roughly 20 mi per day (5 mi to work, then home for lunch, back to work, and back home). Some driving on the weekends, mostly short trips, but occasional highway treks. I had the head gasket done at 158k. By 163k the iron settled down to where it's at now at roughly 5-6ppm per 1000 mi. Prior to the head gasket, iron was 1-2 ppm per 1000 mi. I was not happy with the place that did the HG. I wouldn't be surprised if shoddy workmanship lead to the higher iron levels I now have. For the past 6 UOAs, iron has been steady at 5-6 ppm per 1000 mi. I guess this is my new normal. Car runs fine other than a slow leak at the main seal that the thicker oil has slowed down. With 5W30, I was adding 1qt every 2k mi. Now with the 5W40, it's 1qt every 4k mi. The previous oils on this report are M1 EP HM 5W30 and Pennzoil Euro L 5W30. The baseline (BL) line in the report is the virgin Castrol Euro 5W40. The air filter is a Honda OEM that has been in the car for 18k mi. Silicon seems fine so I'm leaving it in another 6 months. Any ideas why the iron has settled so high after the HG change?