I have had a ticking come and go on this car for over a year. It would usually happen after a hard full throttle run. It has the sound of a lifter. I switched to 10w-40 Royal purple and it went away for a while or wasn't as frequent. I started it this morning and it was fine. After about 5 miles it started to tick enough to make my caspers knock gauge continually run through the lights. I went to the track last month and still had oil in it that was at the 3000 mile range and had no problems. I put fresh oil in it and now the ticking is back.