Here's the scoop. Oil change light came on so I decided to have an analysis done. I had left over still in the garage so I decide to run that as well. While completing the info notes I could not find my last oil change interval. Went through bank statements to see when I last bought the oil (only 1 place here sells it) and it was 1 year ago almost to the day. It was when my water pump went. 16000kms (10000 miles) ago. Now there is a chance I bought some off kijiji (craigslist up here) as I do recall doing that but can't recall when. I do suffer from some memory issues with time frames (1 year could seem like 3 months to me) sadly. So there is a chance that it wasn't as long ago as I think but..... Anyways, here are the tests for what it's worth. Oil I use exclusively is Total Quartz 9000 5w30.