First time (ever) post user. Sorry for any mistakes in protocol and or spelling. In response to the oil change and shortly after engine knocking video. I had this exact same noise emitting from the engine in the same general area front passenger side,(surprisingly but unrelatedly, after an oil change). After reading many posts all over I was mistakenly convinced that the engine was slugged up and over with. After sending this video to a very good mechanic and a friend of mine, he immediately was able to pinpoint the source of the problem. It was a water pump. My 2010 Rav4 (V6) had only 59,000 miles and the pump was already going bad. The repair was covered under warranty which in the water pump case runs out at 60K miles. I can't tell you what a relief that was. In addition, when making this repair, it's a good idea to also have the belts changed since they have to come off anyways for the pump replacement.