Thank you very much for the reports! In the Focus report, it was noted that the silicon value was high. The sample was taken on July 4, 2018. In October 2017, as I was installing new spark plugs, I discovered a head gasket seal leak. I replaced the head gasket and had to also redo the spark plug installation. Hence, there could have been some intrusion from spark plug boot silicon paste, as well as dust/sand during the head gasket removal. I used some cans of air cleaner to get everything clean ahead of the installations, yet I know that contaminant could have remained present. On my way to the post office now with this 2019 sample.