First off the car is an 05 GTO with 52k on it. I've looked through many threads and videos and haven't quite heard exactly what it is that my car sounds like. I know these are noisy engines and sound like a sewing machine but does this sound like normal engine noise? I've dealt with a rod knock before but this seems too quiet to be that. The car was a qt low on oil when I bought it but had it changed pretty much right after I bought it. It does it all the time. Warm or just fired after sitting for a day or two.