I have an 09 g37x coupe. I've owned it for about 3 years now and it's been nothing but amazing except for the starter going out. When I bought the car it had 155K miles and now it has 185K. I love this car and I don't beat on it considering I can't risk blowing it up since i'm still in college and have no money. For a little while now, i've noticed the lifters are getting louder. I can't remember if they were this loud when I bought it, but now it's just irritating. It drives fine, there's no engine codes and like I said I baby this thing, so I don't think anything's broken. I can only hear the noise during idle, anything above 2k rpm's and the noise is basically gone. I know it could either be the vvel actuators or the lifters so right now, i'm trying to figure out if I should put seafoam in the crankcase or not. I've read some good things about it but the threads are pretty old. I'm just worried since it has 185k miles, the seafoam could damage some gaskets or something. Any thoughts?

 

Wow 185K miles!

I don't know what to tell you

Try it and report back

 

It's possible on a worst case that you're lacking oil pressure at idle meaning gallery gaskets have broken enough to leak some of this pressure but not enough to throw a light or mess with your VTC. An oil pressure test will tell you if this is the case.
Try going with higher quality oil, maybe something with ester on it, check your oil levels and see if with new oils this noise goes away.

 

Thanks for the info! I usually use Valvoline FS but right now i'm using Mobil 1 FS high mileage oil. I change every 5K miles which i've done since I bought the car. The noise is hard to explain through text, so here's a video from the inside.

 

Thanks anyways! Will do