After I changed my oil today I looked at the drain plug that I put in at the last change and I could see that the tip was completely covered in small metal dust. It was very apparent after I wiped the drain plug. I was about to send my used oil to Terry for an analysis, but was wondering how skewed my results are going to be. Any input is appreciated. I didnt really research this (how the drain plug affects OUAs), but figuered I ll find an answer this way. Thanks.