Motor started to ping at start up. It has made a little noise for some time. Changed the oil this past week. Mobil one 5w20. It almost sounds like a bag of marbles now. Oil level is correct. No low oil pressure light ( wish it had a gauge). Performance is normal. What gives. Should I flush it. Try some lucas.??????? Don't know where to go. I hate putting stuff other than oil in the motor. Anybody come across this. And any suggestions on what to do would be appreciated. Getting ready to do my superlift in a few weeks. And this is bumming me out.