I have a question and it may have been asked and answered before but please help. I have a 2009 Unlimited Rubicon that started ticking out of the blue the other day. My mechanic said he was sure it was the lifters and for a possible temporary fix to add some engine oil additive because there's 12 of them and there's no way of knowing which one it is. I did, it stopped immediately until 2 days later and another dose of the additive did nothing. I then went and got the oil changed thinking that may fix it but there was no change. By this time I'm getting really upset because I was afraid I was heading for some major engine work. I took it back to my mechanic and he told me that it's fine to drive with it, that it's not hurting anything, just an annoyance and that it may come and go- which it has, it hasn't done it at all today. I completely trust my mechanic as a professional but also because he's a friend...just kind of wanting to get a second opinion- anybody else have one?