Changed my oil this weekend. Car has 4200 miles. Used a WIX filter and royal purple 10w30. It sound like a propane grill ignitor, it's very faint and doesn't sound like a rod knock. Seems to be the same sound that everyone else is getting. I can only hear it at low RPMs like when I am taking off from a stop light. It's not very consistent with the RPMs either. I would like to take it to the dealer but I'm not sure what they are going to tell me with my mods and if they go as far as an oil analysis and see that I'm not using 5w20. Has anyone found an answer yet to this noise?